One discipline always leads to another discipline.
Self-discipline is crucial to a simpler, more contented life.
Cultivate within yourselves the mighty power of self-discipline.
There is only one sort of discipline, perfect discipline.
One painful duty fulfilled makes the next plainer and easier.
It is not enough to have great qualities; We should also have the management of them.
Do not let circumstances control you. You change your circumstances.
The references you do not verify are the good ones.
The most precious of all possessions is power over ourselves.