The First 40 hours of work per week are for survival. Everything after that is for success.

When there's no experimenting there's no progress. Stop experimenting and you go backward. If anything goes wrong, experiment until you get to the very bottom of the trouble.

It is astonishing what an effort it seems to be for many people to put their brains definitely and systematically to work.

Everything is easy when you are busy. But nothing is easy when you are lazy.

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.

He who struggles is better than he who never attempts.