No man or woman has achieved an effective personality who is not self-disciplined. Such discipline must not be an end in itself, but must be directed to the development of resolute Christian character. – John S. Bonnell

No horse gets anywhere until he is harnessed. No life ever grows great until it is focused, dedicated, and disciplined. – Harry Emerson Fosdick

No man is such a conqueror, as the one that has defeated himself. – Henry Ward Beecher

If you will discipline yourself to make your mind self-sufficient you will thereby be least vulnerable to injury from the outside. – Critias of Athens