As a blind man has no idea of colors, so we have no idea of the manner by which the all-wise God perceives and understands all things.

I do not know what I may appear to the world, but to myself I seem to have been only a boy playing on the seashore.

I keep the subject of my inquiry constantly before me, and wait till the first dawning opens gradually, by little and little, into a full and clear light.

You have to make the rules, not follow them

[1.] And first I suppose that there is diffused through all places an aethereal substance capable of contraction & dilatation, strongly elastick, & in a word, much like air in all respects, but far more subtile. 2. I suppose this aether pervades all gross bodies, but yet so as to stand rarer in their pores then in free spaces, & so much ye rarer as their pores are less ... 3. I suppose ye rarer aether within bodies & ye denser without them, not to be terminated in a mathematical superficies, but to grow gradually into one another.

Hypotheses non fingo. I frame no hypotheses.

If I have seen further than others, it is by standing upon the shoulders of giants.