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
A person who is trained to consider his actions, to undertake them deliberately, is in so far forth disciplined. Add to this ability a power to endure in an intelligently chosen course in the face of distraction, confusion, and difficulty, and you have the essence of discipline. – John Dewey