Any nice self improvement sayings?

Question

Quotes for self improvement

Answer 1

"be quick in wisdom, a fool at forty is a fool indeed."

Answer 2

In this world man must either be anvil or hammer.

Henry W. Longfellow

What are the aims which are at the same time duties? They are perfecting of ourselves, the happiness of others.

Immanuel Kant

Many only learns in two ways, one by reading, and the other by association with smarter people.

Will Rogers

Answer 3

There's only one corner of the universe you can be certain of improving, and that's your own self.