We build too many walls and not enough bridges.
Errors are not in the art but in the artificers.
Tact is the art of making a point without making an enemy.
To every action there is always opposed an equal reaction.
It is the weight, not numbers of experiments that is to be regarded.
If I have seen further, it is by standing on the shoulders of giants.
If I have done the public any service, it is due to my patient thought.
I can calculate the motion of heavenly bodies, but not the madness of people.
Plato is my friend — Aristotle is my friend — but my greatest friend is truth.
If I have seen further than others, it is by standing upon the shoulders of giants.