Much travel is needed before a raw man is ripened. - Arab proverb

Live your life as if you know you are going to die tomorrow, but plan your life as if you'll live forever.

The mouth should have three gatekeepers. Is it true? Is it kind? And is it necessary?

He who knows not and knows not that he knows not is a fool. Shun him. He who knows not and knows that he knows not is a child. Teach him. He who knows and knows not that he knows is asleep. Wake him. He who knows and knows that he knows is a wise man. Follow him.