Quote by Ivan Pavlov

"Science demands from a man all his life. If you had two lives they would not be enough for you."

"The great orchestration of the conditional reflex is the highest nervous activity of animals."

"Consciousness is just how the brain labels the neural correlates of attention."

"Do not pursue pleasure, as you would chase a butterfly. Let pleasure come to you."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."