“It is a test mentally, physically and spiritually at times. You must try to stay in the process of creating which will always have obstacles.”

“As physics is a mental reconstruction of material processes, perhaps a physical reconstruction of psychic processes is possible in nature itself.”

“The mental never influences the physical. It is always the physical that modifies the mental, and when we think that the mind is diseased, it is always an illusion.”

“When you're doing a character, you want to know the full landscape. You want to know them spiritually, mentally and physically.”

“First you must have faith in an eternal world independent of you; then you must have faith in your ability to perceive it, and finally you must try to explain it by means of concepts or mathematical constructions. But don't always accept traditional concepts without reexamining them. Even overthrow my relativity theory, if you find a better one.... You must believe that the world was created as a unified whole which is comprehensible to man. Of course, it's going to take an infinitely long time to investigate this unified creation. But to me that is the highest and most sacred duty—unifying physics. Simplicity is the criterion of the universe.”

“Anything that brings spiritual, mental, or physical weakness, touch it not with the toes of your feet.”

“During the examinations, the students are not tested for their mental and physical strengths before entering the exams hall, or class.”

“Our mathematical concepts, structures, ideas have been invented as tools to organise the phenomena of the physical, social and mental world. Phenomenology of a mathematical concept, structure, or idea means describing it in its relation to the phenomena for which it was created, and to which it has extended in the learning process of mankind, and, as far as this description is concerned with the learning process of the young generation, it is didactical phenomenology, a way to show the teacher the places where the learner might step into the learning process of mankind.”

“The spiritual process is just to create the right kind of chemistry, where you are naturally peaceful, naturally joyous.”

“I try to take things that challenge me either physically or mentally, or I have to learn a new skill.”