"Do not consider it proof just because it is written in books, for a liar who will deceive with his tongue will not hesitate to do the same with his pen."

"God does not change, and there is no change in His will."

"The physician should not treat the disease but the patient who is suffering from it."

"The universe is governed by laws which are fixed and unchangeable."

"It is fitting for a person to direct his thoughts towards what is good and beautiful and to avoid what is ugly and shameful."