There are three principal means of acquiring knowledge available to us: observation of nature, reflection, and experimentation. Observation collects facts; reflection combines them; experimentation verifies the result of that combination. Our observation of nature must be diligent, our reflection profound, and our experiments exact. We rarely see these three means combined; and for this reason, creative geniuses are not common.

Note II. — From all that has been said above it is clear, that we, in many cases, perceive and form our general notions: — (1.) From particular things represented to our intellect fragmentarily, confusedly, and without order through our senses (II. xxix. Coroll.); I have settled to call such perceptions by the name of knowledge from the mere suggestions of experience.4 (2.) From symbols, e.g., from the fact of having read or heard certain words we remember things and form certain ideas concerning them, similar to those through which we imagine things (II. xviii. note). I shall call both these ways of regarding things knowledge of the first kind, opinion, or imagination. (3.) From the fact that we have notions common to all men, and adequate ideas of the properties of things (II. xxxviii. Coroll., xxxix. and Coroll. and xl.); this I call reason and knowledge of the second kind. Besides these two kinds of knowledge, there is, as I will hereafter show, a third kind of knowledge, which we will call intuition. This kind of knowledge proceeds from an adequate idea of the absolute essence of certain attributes of God to the adequate knowledge of the essence of things. I will illustrate all three kinds of knowledge by a single example. Three numbers are given for finding a fourth, which shall be to the third as the second is to the first. Tradesmen without hesitation multiply the second by the third, and divide the product by the first; either because they have not forgotten the rule which they received from a master without any proof, or because they have often made trial of it with simple numbers, or by virtue of the proof of the nineteenth proposition of the seventh book of Euclid, namely, in virtue of the general property of proportionals. But with very simple numbers there is no need of this. For instance, one, two, three, being given, everyone can see that the fourth proportional is six; and this is much clearer, because we infer the fourth number from an intuitive gr

I say that it is possible to have some knowledge without the help of the senses. For in the Divine Mind all knowledge exists from eternity, and not only is there in it certain knowledge of universals but also of all singulars. ...Similarly, intelligence receiving irradiation from the primary light see all knowable things, both universal and singulars, in the primary light itself. Moreover, the Divine Mind, in the reflection of its intelligence upon Itself, knows the very things which come after Itself, because it is itself their cause. Therefore, those who are without any senses have true knowledge.

All knowledge is to some extent interpreted.

All types of knowledge, ultimately mean self knowledge.

Knowledge is the distilled essence of our intuitions, corroborated by experience.

Knowledge has three degrees — opinion, science, illumination. The means or instrument of the first is sense; of the second dialectic; of the third intuition. To the last I subordinate reason. It is absolute knowledge founded on the identity of the mind knowing with the object known.

the only way in which a human being can make some approach to knowing the whole of a subject, is by hearing what can be said about it by persons of every variety of opinion, and studying all modes in which it can be looked at by every character of mind. No wise man ever acquired his wisdom in any mode but this; nor is it in the nature of human intellect to become wise in any other manner.

Native scholar Greg Cajete has written that in indigenous ways of knowing, we understand a thing only when we understand it with all four aspects of our being: mind, body, emotion, and spirit. I came to understand quite sharply when I began my training as a scientist that science privileges only one, possibly two, of those ways of knowing: mind and body. As a young person wanting to know everything about plants, I did not question this. But it is a whole human being who finds the beautiful path.

Knowledge has three degrees — opinion, science, illumination. The means or instrument of the first is sense; of the second, logic; of the third, insight.

All our Ideas, or the materials of our reasoning or judging, are received by some immediate Powers of Perception internal or external, which we may call Senses … Reasoning or Intellect seems to raise no new Species of Ideas, but to discover or discern the Relations of those received.

For Native peoples, our systems of knowledge are not about beliefs but about ways of knowing and how we know, through experience itself. It is not what is taught in books, not in ordinary classes, but what lies beneath all the new ideas.

To know. There were different ways of knowing; but none of them was quite so satisfactory, Sax decided, as the direct knowledge of the senses.

It belongeth to us to have three manner of knowings: the first is that we know our Lord God; the second is that we know our self: what we are by Him, in Nature and Grace; the third is that we know meekly what our self is anent our sin and feebleness. And for these three was all the Shewing made, as to mine understanding.