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We used to think that if we knew one, we knew two, because one and one are two. We are finding that we must learn a great deal more about 'and'.

When one teaches, two learn.

When you are allowed to study different disciplines, you redefine your idea of success. You learn to appreciate multiple disciplines simultaneously and you learn that there is no one formula to anything.

Chemically speaking or biologically, we research things, but we don't know half of them. We only know our half of it - symbolically - and we don't know ourselves more than half.

I learned quite early on in life that we are all two people. And one of those people none of us will ever know.

Perhaps, to the uninformed, it may appear unaccountable that a man should be able to retain in his memory such a variety of learning; but the close alliance with each other, of the different branches of science, will explain the difficulty.

Science and literature are not two things, but two sides of one thing.

We have two lives the one we learn with and the life we live after that.

If one is master of one thing and understands one thing well, one has at the same time, insight into and understanding of many things.