He who walks straight rarely falls.
Every now and then go away, have a little relaxation, for when you come back to your work your judgment will be surer. Go some distance away because then the work appears smaller and more of it can be taken in at a glance and a lack of harmony and proportion is more readily seen.
Just as courage imperils life, fear protects it.
Knowledge ... shall always bear witness like a clarion to its creator.
The greatest geniuses sometimes accomplish more when they work less.
The motive power is the cause of all life.