Philosophy begins when one learns to doubt - particularly to doubt one's cherished beliefs, one's dogmas and one's axioms." (Will Durant)

“Too often we enjoy the comfort of opinion without the discomfort of thought.” (John F. Kennedy)

We are here on earth to do good for others. What the others are here for, I don't know.” (W. H. Auden)

“Always do right--this will gratify some and astonish the rest.” (Mark Twain)