Brief is this existence, as a visit in a strange house. The path to be pursued is poorly lit by a flickering consciousness.

A large part of our attitude toward things is conditioned by opinions and emotions which we unconsciously absorb as children from our environment. In other words, it is tradition—besides inherited aptitudes and qualities—which makes us what we are. We but rarely reflect how relatively small as compared with the powerful influence of tradition is the influence of our conscious thought upon our conduct and convictions.

I believe that a simple and unassuming manner of life is best for everyone, best both for the body and the mind.

The future is an unknown, but a somewhat predictable unknown. To look to the future we must first look back upon the past. That is where the seeds of the future were planted. I never think of the future. It comes soon enough.

As far as the laws of mathematics refer to reality, they are not certain, and as far as they are certain, they do not refer to reality.

When I was still a rather precocious young man, I already realized most vividly the futility of the hopes and aspirations that most men pursue throughout their lives.

Just because you believe in something does not mean that it is true.