Reason, Observation, and Experience -- the Holy Trinity of Science.

Reason, Observation and Experience — the Holy Trinity of Science — have taught us that happiness is the only good; that the time to be happy is now, and the way to be happy is to make others so. This is enough for us. In this belief we are content to live and die. If by any possibility the existence of a power superior to, and independent of, nature shall be demonstrated, there will then be time enough to kneel. Until then, let us stand erect.

Reason, observation, and experience; the holy trinity of science.

It has always been a mystery to me how Adam, Eve, and the serpent were taught the same language. Where did they get it? We know now, that it requires a great number of years to form a language; that it is of exceedingly slow growth. We also know that by language, man conveys to his fellows the impressions made upon him by what he sees, hears, smells and touches. We know that the language of the savage consists of a few sounds, capable of expressing only a few ideas or states of the mind, such as love, desire, fear, hatred, aversion and contempt. Many centuries are required to produce a language capable of expressing complex ideas. It does not seem to me that ideas can be manufactured by a deity and put in the brain of man. These ideas must be the result of observation and experience.

If I were to prescribe one process in the training of men which is fundamental to success in any direction, it would be thoroughgoing training in the habit of accurate observation. It is a habit which every one of us should be seeking ever more to perfect.

The true spirit of conversation consists in building on another man's observation, not overturning it