There is nothing of permanent value (putting aside a few human affections) nothing that satisfies quiet reflection--except the sense of having worked according to one's capacity and light to make things clear and get rid of cant and shams of all sorts.

Logical consequences are the scarecrows of fools and the beacons of wise men.

We are prone to see what lies behind our eyes, rather than what apprears before them.

It is a popular delusion that the scientific enquirer is under an obligation not to go beyond generalisation of observed facts...but anyone who is practically acquainted with scientific work is aware that those who refuse to go beyond the facts, rarely get as far.

The more rapidly truth is spread among mankind the better it will be for them. Only let us be sure that it is the truth.

Social progress means a checking of the cosmic process at every step and the substitution for it of another, which may be called the ethical process; the end of which is not the survival of those who may happen to be the fittest, in respect of the whole of the conditions which obtain, but of those who are ethically the best.

It is the first duty of a hypothesis to be intelligible.