Change is scientific; progress is ethical; change is indubitable, whereas progress is a matter of controversy.

This illustrates an important truth, namely, that the worse your logic, the more interesting the consequences to which it gives rise.

You may, if you are an old-fashioned schoolmaster, wish to consider yourself full of universal benevolence and at the same time derive great pleasure from caning boys. In order to reconcile these two desires you have to persuade yourself that caning

What we cannot think we cannot think, therefore we also cannot say what we cannot think.

Fear is the main source of superstition, and one of the main sources of cruelty. To conquer fear is the beginning of wisdom.

None but a coward dares to boast that he has never known fear.

If life is to be fully human it must serve some end which seems, in some sense, outside human life, some end which is impersonal and above mankind, such as God or truth or beauty. Those who best promote life do not have life for their purpose. They aim rather at what seems like a gradual incarnation, a bringing into our human existence of something eternal, something that appears to imagination to live in a heaven remote from strife and failure and the devouring jaws of Time.