Champions don't do extraordinary things. They do ordinary things, but they do them without thinking, too fast for the other team to react. They follow the habits they've learned.

Charles Duhigg

To be disciplined is to follow in a good way. To be self-disciplined is to follow in a better way.

Corita Kent

Success isn't measured by money or power or social rank. Success is measured by your discipline and inner peace.

Mike Ditka

A disciplined mind brings happiness.

Buddha

Persevere in virtue and diligence.

Plautus

Sow a thought, reap an action; sow an action, reap a habit; sow a habit, reap a character; sow a character, reap a destiny.

Stephen Covey