And there is monologue disguised as dialogue, in which two or more men, meeting in space, speak each with himself in strangely tortuous and circuitous ways and yet imagine they have escaped the torment of being thrown back on their own resources. – Martin Buber (1878—1965), translated from German

Once a word has been allowed to escape, it cannot be recalled. – Horace

Never argue with a fool, onlookers may not be able to tell the difference. – Author unknown, attributed to Mark Twain