99 percent of success is built on failure.
Every time you tear a leaf off a calendar, you present a new place for new ideas and progress.
The price of progress is trouble.
Don't be afraid to stumble. Any inventor will tell you that you don't follow a plan far before you strike a snag. If, out of 100 ideas you get one that works, it's enough.
It is not a disgrace to fail. Failing is one of the greatest arts in the world.
I could do nothing without my problems; they toughen my mind. In fact, I tell my assistants not to bring me their successes for they weaken me, but rather to bring me their problems, for they strengthen me.