The commonest fallacy among women is that simply having children makes them a mother - which is as absurd as believing that having a piano makes one a musician.

History repeats itself, but in such cunning disguise that we never detect the resemblance until the damage is done.

Good teaching must be slow enough so that it is not confusing, and fast enough so that it is not boring.

Skepticism is not an end in itself; it is a tool for the discovery of truths.

The difference between patriotism and nationalism is that the patriot is proud of his country for what it does, and the nationalist is proud of his country no matter what it does; the first attitude creates a feeling of responsibility, but the second a feeling of blind arrogance that leads to war.

Almost every man looks more so in a belted trench coat.

Perseverance is the most overrated of traits, if it is unaccompanied by talent; beating your head against a wall is more likely to produce a concussion in the head than a hole in the wall.