William Harvey

And so, in truth, the heart is the beginning of life; the sun of the microcosm, even as the sun of the world.

The heart is the first to live, and the last to die.

Nature is nowhere accustomed more openly to display her secret mysteries than in cases where she shows traces of her workings apart from the beaten path; nor is there any better way to advance the proper practice of medicine than to give our minds to the discovery of the usual law of nature, by careful investigation of cases of rarer forms of disease.

The animal is a machine, and the heart is the prime mover.

It is not the part of a true philosopher to be led by the opinions of others, but to seek the truth from nature herself.

Man is a microcosm, and the heart is the sun of that little world.

Nature does nothing in vain.

The more accurately we observe, the more certainly we know.

It is a thing worthy of observation, that the heart, though it be the fountain of life, is yet the first part that dies.

The knowledge of the circulation of the blood is the key to all medical science.

The human body is a machine, but a machine of a very peculiar kind.

We are born, we live, and we die; and the heart is the engine of this journey.

The beauty of nature is in its order and its laws.

To search for truth is to search for God.

The soul is in the blood.

Life is a continuous motion, a perpetual flux.

Death is but a cessation of motion.

The heart is the seat of the affections, the source of all passions.

The human body is a marvel of divine engineering.

We are but instruments in the hands of nature.