I fear the man of a single book.
Timeo hominem unius libri.

Philosophers
Thomas Aquinas
Born c. 1225 near Roccasecca in southern Italy, Thomas Aquinas was a Dominican friar and the greatest theologian-philosopher of the medieval period. In his magnum opus Summa Theologica he systematically integrated Aristotelian philosophy with Christian theology, representing the summit of Scholasticism. His Five Ways for demonstrating God's existence and his natural-law theory remain foundational in Catholic thought. He holds the title Doctor Angelicus (Angelic Doctor) of the Church.
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Thomas Aquinas's Other Quotes
Grace does not destroy nature but perfects it.
Whatever is received is received according to the mode of the receiver.
Good is to be done and pursued, and evil is to be avoided.
Nothing is in the intellect that was not first in the senses.
Man cannot naturally will the good except under the aspect of the good.
Related Quotes
As in all things, we suffer from excess in reading too. Many books are a burden, not an ornament.
-- Seneca
In the pursuit of learning, one gains daily. In the pursuit of the Tao, one loses daily -- losing and losing until one arrives at wu wei. Through non-action, nothing is left undone.
-- Laozi
Blue dye is extracted from the indigo plant, yet it is bluer than indigo itself.
-- Xunzi
Learning must never cease.
-- Xunzi
Learning without thought is labor lost; thought without learning is perilous.
-- Confucius
When three walk together, one is surely my teacher. I follow what is good and correct what is not.
-- Confucius