"Love is a portion of the soul itself, and it is of the same nature as the soul. It is an ardent, celestial, inextinguishable flame."

"The human soul has an appetite for the truth."

"The greatest test of courage on earth is to bear defeat without losing heart."

"Where the telescope ends, the microscope begins. Which of the two has the grander view?"

"The most beautiful of all things is a beautiful woman with a beautiful mind."