The highest form of pure thought is in mathematics

Thinking begins only when we have come to know that reason, glorified for centuries, is the stiff-necked adversary of thought.

It is a terrible thought, that nothing is ever forgotten; that not an oath is ever uttered that does not continue to vibrate through all times, in the wide spreading current of sound; that not a prayer is lisped, that its record is not to be found st

There are practical little things in housekeeping which no man really understands

Thought means life, since those who do not think so do not live in any high or real sense. Thinking makes the man

The man who never in his mind and thoughts travel'd to heaven is no artist

All ideologies are idiotic, whether religious or political, for it is conceptual thinking, the conceptual word, which has so unfortunately divided man

Let your thoughts meander towards a sea of ideas

Ideas came with explosive immediacy, like an instant birth. Human thought is like a monstrous pendulum; it keeps swinging from one extreme to the other

All my life I have tried to pluck a thistle and plant a flower wherever the flower would grow in thought and mind