Science progresses best when observations force us to alter our preconceptions. Vera Rubin
We are very much what others think of us. The reception our observations meet with gives us courage to proceed, or damps our efforts. William Hazlitt
I have never yet seen any plan which has not been mended by the observations of those who were much inferior in understanding to the person who took the lead in the business. Edmund Burke
... very often the laws derived by physicists from a large number of observations are not rigorous, but approximate. Augustin Louis Cauchy
All our scientific observations of the universe and quanta can only, in the end, be observations of ourselves. Alan Moore
Passion makes the best observations and the sorriest conclusions. Jean Paul