Theosophy is the modern name given by H. P. Blavatsky to what is described by her as the once universal but now hidden Wisdom-Religion, the parent source of all known religions. This original Wisdom-Religion had been preserved intact out of the reach of the many conflicting sects, who each thought that their piece of it was the only truth.

HPB:...Theosophy is Divine Knowledge or Science... "Divine Wisdom," (Theosophia) or Wisdom of the gods, as (theogonia), genealogy of the gods. The word theos means a god in Greek, one of the divine beings, certainly not "God" in the sense attached in our day to the term. Therefore, it is not "Wisdom of God," as translated by some, but Divine Wisdom such as that possessed by the gods. The term is many thousand years old... It comes to us from the Alexandrian philosophers, called lovers of truth, Philaletheians, from phil "loving," and aletheia "truth." The name Theosophy dates from the third century of our era, and began with Ammonius Saccas and his disciples, who started the Eclectic Theosophical system.

Theosophy neither attacks nor opposes any form of religion; on the contrary, it explains and harmonizes all. It holds that all religions alike are attempts to state the same great underlying truths— differing in external form and in nomenclature, because they were delivered by different teachers, at different periods of the world’s history, and to widely different races of men; but always agreeing in fundamentals, and giving identical instruction upon every subject of real importance. We* hold in Theosophy that this truth which lies at the back of all these faiths alike is itself within the reach of man, and indeed it is to that very truth that we give the name Theosophy, or Divine Wisdom, and it is that which we are trying to study.

Amongst various sects so numerous in America today who find their fundamental basis in occultism, the Theosophist stands pre-eminent both in intelligence and point of numbers. Theosophy is not a religion. Its followers are simply “searchers after Truth”. The Theosophists, in fact, are the dissatisfied with the world, dissenters from all creeds. They owe their origin to the wise men of India, and are numerous, not only in the far famed mystic East, but in England, France, Germany and Russia. They admit the existence of a God – not necessarily of a personal God. To them God is Nature and Nature is God…But despite this, if Christianity is Truth, as our education has taught us to believe, there can be no menace to it in Theosophy.

We often speak of Theosophy as not in itself a religion, but the truth which lies behind all religions alike. That is so; yet, from another point of view, we may surely say that it is at once a philosophy, a religion and a science. It is a philosophy, because it puts plainly before us an explanation of the scheme of evolution of both the souls and the bodies contained in our solar system.

Theosophy holds that all things, including the human mind, are evolving. We are in the midst of an unfinished world and are ourselves unfinished.

Right thought is necessary to right conduct, right understanding to right living, and the Divine Wisdom – whether called by its ancient Sanskrit name of Brahma Vidyā, or its modern Greek name of Theosophia, Theosophy – comes to the world as at once an adequate philosophy and an all-embracing religion and ethic. It was once said of the Christian Scriptures by a devotee that they contained shallows in which a child could wade and depths in which a giant must swim. A similar statement might be made of Theosophy, for some of its teachings are so simple and so practical that any person of average intelligence can understand and follow them, while others are so lofty, so profound, that the ablest strains his intellect to contain them and sinks exhausted in the effort.

It is not a belief or dogma formulated or invented by man, but is a knowledge of the laws which govern the evolution of the physical, astral, psychical, and intellectual constituents of nature and of man. The religion of the day is but a series of dogmas man-made and with no scientific foundation for promulgated ethics; while our science as yet ignores the unseen, and failing to admit the existence of a complete set of inner faculties of perception in man, it is cut off from the immense and real field of experience which lies within the visible and tangible worlds. But Theosophy knows that the whole is constituted of the visible and the invisible, and perceiving outer things and objects to be but transitory it grasps the facts of nature, both without and within. It is therefore complete in itself and sees no unsolvable mystery anywhere; it throws the word coincidence out of its vocabulary and hails the reign of law in everything and every circumstance.

Although it contains by derivation the name God and thus may seem at first sight to embrace religion alone, it does not neglect science, for it is the science of sciences and therefore has been called the wisdom religion. For no science is complete which leaves out any department of nature, whether visible or invisible, and that religion which, depending solely on an assumed revelation, turns away from things and the laws which govern them is nothing but a delusion, a foe to progress, an obstacle in the way of man's advancement toward happiness. Embracing both the scientific and the religious, Theosophy is a scientific religion and a religious science.

The handbills announce me as the President of the Theosophical Society, and you gathered here to learn what Theosophy is and what are its relations with Spiritualism. Let me say then, that in the sense given to it by those who first used it, the word means divine wisdom, or the knowledge of divine wisdom, or the knowledge of divine things... Essentially, a Theosophical Society is one which favours man’s original acquisition of knowledge about the hidden things of the universe by the education and perfecting of his own latent powers.

Secondly, Theosophy never endeavours to convert any man from whatever religion he already holds. On the contrary, it explains his religion to him, and enables him to see in it deeper meanings than he has ever known before. It teaches him to understand it and live it better than he did, and in many cases it gives back to him, on a higher and more intelligent level, the faith in it which he had previously all but lost. Ch. I

The teachings of Theosophy deal for the present chiefly with our earth, although its purview extends to all the worlds, since no part of the manifested universe is outside the single body of laws which operate upon us. Our globe being one of the solar system is certainly connected with Venus, Jupiter, and other planets, but as the great human family has to remain with its material vehicle — the earth — until all the units of the race which are ready are perfected, the evolution of that family is of greater importance to the members of it. Some particulars respecting the other planets may be given later on. First let us take a general view of the laws governing all.

You write you could never be a Theosophist. Well I suppose I could say the same thing, if you're referring to what most theosophists are. But that does not alter the fact that I believe that the principles of theosophy are true, and that it leads to clarity in one's spiritual development. Which means that we [= Mondrian ànd the catholic painter and his former teacher L. Schelfhout, after their reconciliation] quite agree on this point. Self-awareness is, in my view, of crucial importance to all human beings. I can understand how the Catholic doctrine may lead to vagueness, but Theosophy, which is a spiritual science, can never do so.

It deals with the present by describing what man really is, as seen by means of developed faculties. It is customary to speak of man as having a soul. Theosophy, as the result of direct investigation, reverses that dictum, and states that man is a soul, and has a body -- in fact several bodies, which are his vehicles and instruments in various worlds. These worlds are not separate in space; they are simultaneously present with us, here and now, and can be examined; they are the divisions of the material side of Nature--different degrees of density in the aggregation of matter, as will presently be explained in detail. Man has an existence in several of these, but is normally conscious only of the lowest, though sometimes in dreams and trances he has glimpses of some of the others.