Knowledge without practice is useless. Practice without knowledge is dangerous.

He who loves practice without theory is like the sailor who boards ship without a rudder and compass and never knows where he may cast.

To be fond of learning is to be near to knowledge. To practice with vigor is to be near to magnanimity. To possess the feeling of shame is to be near to energy.

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.

The real work is in the practice.