The famous sayings are as follows:

1. "I think, therefore I am" - Descartes.

2. "Thought is the master of everything" - Voltaire.

3. "The mind is the greatest force in the universe" - Einstein.

4. "Truth is created by the activities of human thinking" - Hegel.

5. "The world is a construct in our minds" - Spinoza.

6. "Thought is the forerunner of all things" - Kant.

7. "Human essence is reflected in thought" - Feuerbach.

8. "Consciousness is the advanced form of matter" - Lenin.