The infinite library of the Universe is in your mind.

It is the calm, forgiving, equable, well-balanced mind that does the greatest amount of work.

The cheerful mind perseveres and the strong mind hews its way through a thousand difficulties.

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.

Pay no mind to those who talk behind your back, it simply means that you are two steps ahead.