"One and one make two" assumes that the changes in the shift of circumstance are unimportant. But it is impossible for us to analyze this notion of unimportant change.

What is morality in any given time or place? It is what the majority then and there happen to like and immorality is what they dislike.

Life is complex in its expression, involving more than percipience, namely desire, emotion, will, and feeling.

Each generation criticizes the unconscious assumptions made by its parent. It may assent to them, but it brings them out in the open.

The motive of success is not enough.

Now in creative thought common sense is a bad master. Its sole criterion for judgement is that the new ideas shall look like the old ones. In other words it can only work by suppressing originality.

The aim of science is to seek the simplest explanation of complex facts. We are apt to fall into the error of thinking that the facts are simple because simplicity is the goal of our quest. The guiding motto in the life of every natural philosopher should be ``Seek simplicity and distrust it.''