Wealth as well as sea water. The more we drink, the more thirsty. The so famous

Noise is the most impertinent of all forms of interruption. It is not only an interruption, but also a disruption of thought.

Every man takes the limits of his own field of vision for the limits of the world. This is an error of the intellect as inevitable as that error of the eye which lets you fancy that on the horizon heaven and earth meet.

Talent is able to achieve what is beyond other people's capacity to achieve, yet not what is beyond their capacity of apprehension; therefore it at once finds its appreciators. The achievement of genius, on the other hand, transcends not only others' capacity of achievement, but also their capacity of apprehension; therefore they do not become immediately aware of it. Talent is like the marksman who hits a target which others cannot reach; genius is like the marksman who hits a target, as far as which others cannot even see.

That arithmetic is the basest of all mental activities is proved by the fact that it is the only one that can be accomplished by a machine.

You can do what you will, but in any given moment of your life you can will only one definite thing and absolutely nothing other than that one thing.

The scenes of our life are like pictures done in rough mosaic. Looked at close, they produce no effect. There is nothing beautiful to be found in them, unless you stand some distance off.