Logic can take you from point A to point B. Imagination can take you wherever you want
The more I learn of physics, the more I am drawn to metaphysics.
The world is so full of possibilities that dogmatism is simply indecent.
In conclusion I wish to say that in working at the problem here dealt with I have had the loyal assistance of my friend and colleague M. Besso, and that I am indebted to him for several valuable suggestions.
You can't use an old map to explore a new world.
I like neither new clothes nor new kinds of food.