He was always truthful; he was always sincere; he was always honest and honorable. But in light matters -- matters of small consequence, like religion and politics and such things -- he never acquired a conviction that could survive a disapproving remark from a cat.
- Autobiography of Mark Twain

I always recognize his many merits & excellent virtues when he is out of my sight, but he is sure to irritate me & make me see his less pleasant features when he is with me.
- Letter to Pamela Moffett, 28 April 1873

Orion is a field which grows richer & richer the more he manures it with each new top-dressing of religion or other guano.
- Letter to William Dean Howells, 15 September 1879