Whether or not you can observe a thing depends upon the theory you use. It is the theory which decides what can be observed.

The state is made for man, not man for the state.... That is to say, the state should be our servant and not we its slaves

Only a monomaniac gets anything done.

Only morality in our actions can give beauty and dignity to life.

The economists will have to revise their theories of value.

The idle man does not know what it is to enjoy rest.

We have penetrated far less deeply into the regularities obtaining within the realm of living things, but deeply enough nevertheless to sense at least the rule of fixed necessity... what is still lacking here is a grasp of the connections of profound generality, but not a knowledge of order itself.