Leonardo da Vinci

"Once you have tasted flight, you will forever walk the earth with your eyes turned skyward."

"He who loves practice without theory is like the sailor who steers without rudder and compass."

"The noblest pleasure is the joy of understanding."

"Simplicity is the ultimate sophistication."

"Learning never exhausts the mind."

"The eye which truly sees is the eye of the heart."

"Nothing strengthens authority so much as silence."

"Tears come from the heart and not from the brain."

"Life without love is like a tree without blossoms or fruit."

"The greatest deception men suffer is from their own opinions."

"Where the spirit does not work with the hand, there is no art."

"All knowledge begins with wonder."

"The supreme misfortune is when theory outpaces performance."

"A beautiful body perishes, but a work of art dies not."

"The mind that opens to a new idea never returns to its original dimensions."

"Art is the queen of all sciences communicating knowledge to all the generations of the world."

"While I thought I was learning how to live, I have been learning how to die."

"The acquisition of knowledge is the mission of research."

"See that the light within you does not become darkness."

"Knowing is not enough; we must apply. Willing is not enough; we must do."

"The time to repair the roof is when the sun is shining."

"In everyone's life, at some time, our inner fire goes out. It is then burst into flame by an encounter with another human being."

"Nature is the supreme teacher; study it and you will never lack models."

"The eye is called the window of the soul."

"Obstacles cannot crush me; every obstacle yields to stern resolve."

"The details are not details. They make the design."

"Develop your senses—especially learn how to see."

"Man cannot reveal his past in his work, and he cannot hide it."

"Whoever in dispute appeals to authority uses not intellect but memory."

"The human foot is a masterpiece of engineering and a work of art."