There is only one proof of ability - action.

The mediocre always feel as if they're fighting for their lives when confronted by the excellent.

Many think they have a kind heart who have only weak nerves.

I regret nothing, says arrogance; I will regret nothing, says inexperience.

Old age transfigures or fossilizes.

To be content with little is difficult; to be content with much, impossible.

"People's minds are trained largely at the expense of their hearts." This is not so; it is only that there are more educable minds than there are educable hearts.