It always seems to me extreme rashness on the part of some when they want to make human abilities the measure of what nature can do. On the contrary,… - Galileo Galilei

There is not a single effect in Nature, not even the least that exists, such that the most ingenious theorists can ever arrive at a complete understanding of it. This vain presumption of understanding everything can have no other basis than never understanding anything. For anyone who had experienced just once the perfect understanding of one single thing, and had truly tasted how knowledge is attained, would recognise that of the infinity of other truths he understands nothing.

This vain presumption of understanding everything can have no other basis than never understanding anything.

You cannot teach a person anything, you can only help him find it within himself.

In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual.

I see that you have hitherto been one of that herd who, in order to learn how matters such as this take place, and in order to acquire a knowledge of natural effects, do not exhaust themselves in waking and studying, and mortify themselves with experiments and observations, but retire into their studies and glance through an index and a table of contents to see whether Aristotle has said any thing about them; and, being assured of the true sense of his text, consider that nothing else can be known.