Boethius

In 523 Boethius (480-524), who was the head of the civil service and chief of the palace officials for Theodoric The Great in Rome, was arrested on suspicion of secret dealings with Theodoric’s enemies in Constantinople. During his time in prison awaiting execution, he wrote The Consolation of Philosophy, which encouraged man to find consolation through meditation and prayer. During the Middle Ages this was a much-revered work and both Chaucer and Queen Elizabeth 1st translated it into English.
Boethius also wrote five theological treatises, which systematically applied the logic of Aristotle to Christian theology. They earned him the label of the first of the scholastic philosophers- one who attempts to use philosophy to explain Christian faith.
Boethius famously claimed that it is wrong to say what God is. Instead we should say what God is not, since the moment we say what he is we reduce him, thus diminishing him to the level of our inadequate thoughts and even more inadequate language.

Aristotle

Aristotle (384-323 BC) was a Greek philosopher who advocated reason and moderation. Aristotle taught that ethics is the study of which types of conduct produce happiness: Vices are the excess or defect of virtues. He maintained that the greatest of all virtues is speculative wisdom. Aristotle was the first western man to argue that the universe owes its existence to an intelligent being eg God.