Sometimes you must go to war with yourself to fix yourself.

David Goggins

Be gentle to all and stern with yourself.

Saint Teresa of Ávila

Reaction is the enemy of creation. Creation requires deep sustained focus. This focus is under constant attack by "notifications" that encourage you to respond to unending false emergencies. Protect your attention and direct it to where it is most valuable.

The Stoic Emperor

Champions do not become champions when they win the event, but in the hours, weeks, months and years they spend preparing for it. The victorious performance itself is merely the demonstration of their championship character.

Alan Armstrong

At the center of bringing any dream into fruition is self-discipline.

Will Smith

The point is whether or not I improved over yesterday. In long-distance running the only opponent you have to beat is yourself, the way you used to be.

Haruki Murakami