Ibn Sina

"The human being is not made for solitude, yet solitude is sometimes the greatest teacher."

"Medicine is a science by which we learn the various states of the human body in health and in sickness, and the means by which health is likely to be lost and won."

"Whoever is not capable of learning should not teach others."

"The cause of sickness is change; the cause of health is stability."

"Imagination is the power that penetrates into the invisible."

"A man who has health has hope, and he who has hope has everything."

"The greatest wisdom is in understanding the nature of things."

"In mathematics, there is no ignorabimus - we must know."

"Truth is that which corresponds to reality and to which the intellect assents."

"The self is that which is aware of its own awareness."

"Art is the imitation of nature in her manner of operation."

"Every man, as he grows older, finds that all the errors of his youth rush upon him."

"Beauty is the harmony of opposing elements in a unified whole."

"The perfection of the intellect is a human perfection."

"One should go into the next world lacking nothing in as far as is possible."

"Music soothes the soul and elevates the spirit to divine contemplation."

"Patience is the virtue of the strong and the strength of the virtuous."

"The existence of motion is evident from sensory perception."

"Kindness is not an act, it is an attitude that becomes a way of life."

"Knowledge is a light that cannot be extinguished by any darkness."

"A man has two kinds of intellect: the speculative and the practical."

"The fear of death is nothing but fear of the unknown made manifest."

"True justice is when all are treated equally regardless of station."

"The greatest courage is found not in the battlefield but in the struggle with oneself."

"Time is the measure of motion and rest."

"Inspiration comes to those who prepare their minds to receive it."

"The heart has its own logic that reason cannot comprehend."

"Freedom without wisdom is tyranny of the self."

"Nature operates according to laws that the mind can discover."

"Peace is achieved through understanding, not through domination."