Aristotle

The embryo is a living thing from the very beginning.

The study of animals contributes to our knowledge of the soul.

The parts of animals are for the sake of something.

The final cause is the end for which a thing exists.

Nature always strives for the best.

The more perfect the animal, the more complex its organization.

The senses are the gateways to knowledge.

The soul is the principle of life.

The study of nature is the study of the divine.

The physician must know the causes of disease.

The body is the instrument of the soul.

The study of animals is not to be despised.

The most beautiful things are those which are most natural.

The generation of animals is a continuous process.

The seed is the beginning of the animal.

The senses are never deceived about their proper objects.

The soul is that by which we live, perceive, and think.

The study of nature is a noble pursuit.

The physician must be a good observer.

The body is composed of elements.