I have been impressed with the urgency of doing. Knowing is not enough; we must apply. Being willing is not enough; we must do.
Leonardo da Vinci

People always ask me, 'What is it that you regret?' And I say, 'nothing, because I could not buy what I've learned.' And I apply those things to my life I learn. And hopefully, hopefully it helps me to be a better human in the future and make better choices.
Katy Perry

Apply yourself both now and in the next life. Without effort, you cannot be prosperous. Though the land be good, You cannot have an abundant crop without cultivation.
Plato

Experience demands that man is the only animal which devours his own kind, for I can apply no milder term to the general prey of the rich on the poor.
Thomas Jefferson

There is nothing so easy to learn as experience and nothing so hard to apply.
Josh Billings

It is wise to apply the oil of refined politeness to the mechanism of friendship.
Sidonie Gabrielle Colette