The real work is in the practice.

The benefits of knowledge can only be realized in practice.

By practice men can bring even the heart under control, until it will just beat at will, slowly, or quickly, or almost stop. Nearly every part of the body can be brought under control.

Practice is absolutely necessary. You may sit down and listen to me by the hour every day, but if you do not practice, you will not get one step further. It all depends on practice.

Practice makes us what we shall be.

In almost every area of human endeavor, the practice improves over time. That hasn't been the case for teaching.