A small error in the former will produce an enormous error in the latter.

Ideas rose in clouds; I felt them collide until pairs interlocked, so to speak, making a stable combination.

All great progress takes place when two sciences come together, and when their resemblance proclaims itself, despite the apparent disparity of their substance.

If nature were not beautiful, it would not be worth knowing, and if nature were not worth knowing, life would not be worth living

It may happen that small differences in the initial conditions produce very great ones in the final phenomena.

Later generations will regard Mengenlehre (set theory) as a disease from which one has recovered.

Hypotheses are what we lack the least.