You take all of the experience and judgment of men over 50 out of the world and there wouldn't be enough left to run it.

What, start at this! when sixty years have spread Their grey experience o'er thy hoary head? Is this the all observing age could gain? Or hast thou known the worl so long in vain?

The only real mistake is the one from which we learn nothing.

Life is a series of experiences, each one of which makes us bigger, even though sometimes it is hard to realize this

Obstacles are those frightful things you see when you take your eyes off the goal.

Work is futile if we cannot utilise the experience we collect in one life in the next.