Ernst Haeckel

The 'soul' is a physiological function of the brain, just as thought is.

Our task is to unveil the hidden laws of nature.

The theory of evolution provides a complete and coherent explanation for the diversity of life.

There is no fundamental difference between the 'soul' of man and the 'soul' of an animal.

The progress of science is the progress of humanity.

The cell theory is the foundation of all modern biology.

Monism offers a unified understanding of the physical and mental worlds.

We must strive for a rational and scientific worldview.

The history of the earth is a history of continuous change and development.

The concept of free will is an illusion.

Art and science are two sides of the same coin, both seeking to understand and represent the world.

The human organism is a complex machine, governed by physical and chemical laws.

The greatest enemy of truth is not falsehood, but prejudice.

The study of embryology provides crucial evidence for evolution.

The universe is a self-regulating system, without need for external intervention.

Our duty is to spread the light of knowledge and reason.

The 'soul' is a collective name for the sum of the cerebral functions.

The theory of evolution is the greatest scientific discovery of all time.

Man is not above nature, but in nature.

The history of the development of the human race is the history of the development of the human brain.