A collection of quotations

Discipline is the bridge between goals and accomplishments.
unknown

Only one who devotes himself to a cause with his whole strength and soul can be a true master. For this reason mastery demands all of a person.
Albert Einstein

What it lies in our power to do, it lies in our power not to do.
Aristotle

Do not consider painful what is good for you.
Euripides

Know the [higher] Self as the Lord who sits in the chariot called the body; buddhi (intelligence) is the charioteer; mind the reins, the senses are the horses, and the objects are the roads. The Self is the controller and enjoyer. But he who has no understanding, but is weak in mind, his senses run riot like the vicious horses of a charioteer. He who has understanding and is strong-minded, his senses are well controlled like the good horses of a charioteer.
Katha Upanishad

When force of circumstance upsets your equanimity, lose no time in recovering your self-control, and do not remain out of tune longer than you can help. Habitual recurrence to the harmony will increase your mastery of it.
Marcus Aurelius