From philosophy professor James Spiegel (via JT):

Augustine (5th century): Remember that you are a citizen of another kingdom.

Martin Luther (16th century): Expect politicians to be corrupt.

Thomas Aquinas (13th century): God has made himself known in nature.

John Calvin (16th century): God is sovereign over all, including our suffering.

Jonathan Edwards (18th century): God is beautiful, and all beauty is divine.

Thomas a’Kempis (15th century): Practice self-denial with a passion.

John Wesley (18th century): Be disciplined and make the best use of your time.

Fyodor Dostoevsky (19th century): God’s grace can reach anyone.

Dietrich Bonhoeffer (20th century): Beware of cheap grace.

Alvin Plantinga (21st century): Moral virtue is crucial for intellectual health.

Read the whole post to get the bigger picture.
pdb