Nothing in life is to be feared, it is only to be understood. Now is the time to understand more, so that we may fear less.
Marie Curie

A mind all logic is like a knife all blade. It makes the hand bleed that uses it.
Rabindranath Tagore

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.
Leonardo Da Vinci