The search for something permanent is one of the deepest of the instincts leading men to philosophy.

...classic philosophy maintained that change, and consequently time, are marks of inferior reality, holding that true and ultimate reality is immutable and eternal. Human reasons, all too human, have given birth to the idea that over and beyond the lower realm of things that shift like the sands on the seashore there is the kingdom of the unchanging, of the complete, the perfect. The grounds for the belief are couched in the technical language of philosophy, but the grounds for the cause is the heart's desire for surcease from change, struggle, and uncertainty. The eternal and immutable is the consummation of mortal man's quest for certainty.

Metaphysics has a long and distinguished history, and it is consequently unlikely that there are any new truths to be discovered in descriptive metaphysics. But this does not mean that the task of descriptive metaphysics has been, or can be, done once for all. It has constantly to be done over again. If there are no new truths to be discovered, there are old truths to be rediscovered. For though the central subject-matter of descriptive metaphysics does not change, the critical and analytical idiom of philosophy changes constantly. Permanent relationships are described in an impermanent idiom, which reflects both the age’s climate of thought and the individual philosopher’s personal style of thinking. No philosopher understands his predecessors until he has re-thought their thought in his own contemporary terms; and it is characteristic of the very greatest philosophers, like Kant and Aristotle, that they, more than any others, repay this effort of re-thinking

To quote the words of Timaeus, in Plato, "What is that which always is, and has no birth, and what is that which is always becoming but never is? The one is apprehended by the mental processes, with reasoning, and is ever the same; the other can be guessed at by opinion in company with unreasoning sense, a thing which becomes and passes away, but never really is."
Therefore, if we crave for the goal which is worthy and fitting for man, namely happiness of life—and this is accomplished by philosophy alone and nothing else, and philosophy means... for us desire for wisdom, and wisdom the science of the truth of things... it is reasonable and most necessary to distinguish and systematize the accidental qualities of things.

Immobile, certain, and permanent things, ideas, works and beliefs change, transform, and disintegrate...Movement is the only static, final, permanent, and certain thing. Static means transformation...Do not hold on to anything...Do not pinpoint anything!.. .We are fooling ourselves if we close our eyes and refuse to recognize the change.. .Decomposition begins only when we try to prevent it.. .We would so much like to own, think, or be something static, eternal, and permanent. However, our only eternal possession will be change.. .To attempt to hold fast an instant is doubtful.. .How beautiful it is to be transitory. How lovely it is not to have to live forever.

The most permanent thing in this world is change.

Philosophy is nothing else than striving through constant contemplation and saintly piety to attain knowledge of God.

Nothing in the world is permanent, and we're foolish when we ask anything to last, but surely we're still more foolish not to take delight in it while we have it. If change is of the essence of existence one would have thought it only sensible to make it the premise of our philosophy.

Thus I repudiate facility. I recommend a certain manner of thinking which courts difficulty; I value effort above everything. How could certain people have mistaken my meaning? To say nothing of the kind of person who would insist that my “intuition” was instinct or feeling. Not one line of what I have written could lend itself to such an interpretation. And in everything I have written there is assurance to the contrary: my intuition is reflection. But because I called attention to the mobility at the base of things, it has been claimed that I encouraged a sort of relaxing of the mind. And because the permanence of substance was, in my eyes, a continuity of change, it has been said that my doctrine was a justification of instability. One might just as well imagine that the bacteriologist recommends microbic diseases to us when he shows us microbes everywhere, or that the physicist prescribes the exercise of swinging when he reduces natural phenomena to oscillations. A principle of explanation is one thing, a maxim of conduct is another. One could almost say that the philosopher who finds mobility everywhere is the only one who cannot recommend it, since he sees it as inevitable, since he discovers it in what people have agreed to call immobility. But the truth is that in spite of the fact that he views stability as a complexity of change or as a particular aspect of change, in spite of the fact that in some way he resolves stability into change he will none the less, like everybody else, distinguish stability and change. And for him, as for everyone, will arise the question of knowing to what extent it is the special appearance called stability, to what extent it is change pure and simple that he must recommend to human societies. His analysis of change leaves this question intact. If he has any common sense at all, he, like everyone else, will consider necessary a permanence of what is. He will say that institutions should furnish a relatively invariable framework

Philosophy is an everlasting fire, sometimes damped down by setting itself limits, then flaring into new life as it consumes them. Every field of inquiry is limited, but philosophy has an essential relation to the question of limits, to its own limits.

Philosophy is the self-correction by consciousness of its own initial excess of subjectivity. Each actual occasion contributes to the circumstances of its origin additional formative elements deepening its own peculiar individuality. Consciousness is only the last and greatest of such elements by which the selective character of the individual obscures the external totality from which it originates and which it embodies. An actual individual, of such higher grade, has truck with the totality of things by reason of its sheer actuality; but it has attained its individual depth of being by a selective emphasis limited to its own purposes. The task of philosophy is to recover the totality obscured by the selection.

When one begins to reflect on philosophy — then philosophy seems to us to be everything, like God, and love. It is a mystical, highly potent, penetrating idea — which ceaselessly drives us inward in all directions. The decision to do philosophy — to seek philosophy is the act of self-liberation — the thrust toward ourselves.

Philosophy... is that activity by which the meaning of propositions is established or discovered. Philosophy elucidates propositions, science verifies them. In the latter we are concerned with the truth of statements, but in the former with what they actually mean.

Philosophy is the attempt to formulate principles or categories which the philosopher already possesses, in common with everyone else, but in an unformulated state.