Humphry Davy

The only constant in life is change.

The more I learn, the more I realize how much I don't know.

The greatest adventure is to live the life of your dreams.

The true measure of a man is not what he has, but what he gives.

The most important thing is to enjoy your life – to be happy – it's all that matters.

The world is a book, and those who do not travel read only one page.

I have always been a firm believer in the power of observation and experimentation.

The true scientist is one who is never satisfied with what he knows.

The greatest discoveries are often made by accident.

The most important of my discoveries have been suggested to me by my failures.

Nothing is so fatal to a nation as an extreme of either wealth or poverty; and perhaps the most invariable symptom of the decay of a state is the introduction of a spirit of luxury among its citizens.

The scientific world is to be regarded as a single great society, of which all individual chemists are members.

I am convinced that there is no natural process which can be followed with such certainty as that of galvanic action.

The love of gain has no bounds; but the love of science is pure and disinterested.

In the midst of the ruins of a decayed empire, the light of science still shines.

Chemistry is the art of separating, joining, and changing substances.

The progress of human knowledge is like the motion of the planets; it seems slow, but it is constant.

To live without friends is to live like the beasts.

The lamp which I have constructed will preserve the miner from the fatal effects of the firedamp.

Nature is a temple, but science is the key to its doors.