wisdom

A great ship asks deep waters.

it means that

A wise man changes his mind, a fool never will.

states that

If things were to be done twice all would be wise.

meaning

Reason does not come before years.

said to mean that

Knowledge in youth is wisdom in age.

meaning that

Have an old head on young shoulders.

meaning that

Who knows most, speaks least

meaning that

Out of the mouths of babes

means that