“The storm had now definitely abated, and what thunder there was now grumbled over more distant hills, like a man saying 'And another thing…' twenty minutes after admitting he'd lost the argument.”

Source: Look Homeward, Angel

Source: The Charioteer (1953), p. 285
Context: You mustn't get so upset about what you feel, Spud. No one's a hundred per cent consistent all the time. We might like to be. We can plan our lives along certain lines. But you know, there's no future in screwing down all the pressure valves and smashing in the gauge. You can do it for a bit and then something goes. Sometimes it gets so that the only thing is just to say, 'That's what I'd like to feel twenty-four hours a day; but, the hell with it, this is how I feel now.

WTF Is…? series, Day One: Garry's Incident (October 1, 2013)

Overture: Prelude http://www.gutenberg.org/files/30630/30630-h/30630-h.htm#Page_20
A Guide to Men (1922)

"Thrasymachus", in "On the Indestructibility of our Essential Being by Death, in Essays and Aphorisms (1970) as translated by R. J. Hollingdale, p. 76
Parerga and Paralipomena (1851), Aphorisms on the Wisdom of Life

Social Aims
Sometimes condensed to "What you do speaks so loud that I cannot hear what you say."
1870s, Society and Solitude (1870), Books, Letters and Social Aims http://www.rwe.org/comm/index.php?option=com_content&task=category&sectionid=5&id=74&Itemid=149 (1876)

The Mysteries of Udolpho, Shipwreck; reported in Hoyt's New Cyclopedia Of Practical Quotations (1922), p. 704.
Attributed

Diogenes Laertius