Mankind? That is an abstraction. There have always been and always will be only individuals.

There are situations in which hope and fear run together, in which they mutually destroy one another and lose themselves in dull indifference.

It is not enough to have knowledge; one must apply it. It is not enough to have wishes; one must also accomplish it.

The day is committed to error and floundering; success and achievement are matters of long range.

Whatever you can do or dream, begin it.

We all walk in mysteries. We are surrounded by an atmosphere about which we still know nothing at all.

Reason can never be popular. Passions and feelings may become popular, but reason will always remain the sole property of a few eminent individuals.