Age is an issue of mind over matter. If you don't mind, it doesn't matter.

Troubles are only mental; it is the mind that manufactures them, and the mind can gorge them, banish them, abolish them.

Be devoted to conscientiousness. Guard your own mind.

There's a phrase in Buddhism, 'Beginner's mind.' It's wonderful to have a beginner's mind.

More than those who hate you, more than all your enemies, an undisciplined mind does greater harm.

There is nothing so disobedient as an undisciplined mind, and there is nothing so obedient as a disciplined mind.