“Men may be very learned, and yet very miserable; it is easy to be a deep geometrician, or a sublime astronomer, but very difficult to be a good man. I esteem, therefore, the traveller who instructs the heart, but despise him who only indulges the imagination. A man who leaves home to mend himself and others, is a philosopher; but he who goes from country to country, guided by the blind impulse of curiosity, is only a vagabond.”

G 8
Aphorisms (1765-1799), Notebook G (1779-1783)

Aphorism 44
Les Caractères (1688), Du mérite personnel
Context: That man is good who does good to others; if he suffers on account of the good he does, he is very good; if he suffers at the hands of those to whom he has done good, then his goodness is so great that it could be enhanced only by greater sufferings; and if he should die at their hands, his virtue can go no further: it is heroic, it is perfect.

15
1940s–present, Minority Report : H.L. Mencken's Notebooks (1956)
Context: Human life is basically a comedy. Even its tragedies often seem comic to the spectator, and not infrequently they actually have comic touches to the victim. Happiness probably consists largely in the capacity to detect and relish them. A man who can laugh, if only at himself, is never really miserable.

The Name of the Rose (1980)

No Maps for These Territories (2000)

remark made in 1971, cited in Roger Lewis, Anthony Burgess (2002), p. 152
General

Address in Memphis, Tennessee (25 October 1905) http://www.trsite.org/content/pages/speaking-loudly
1900s

1910s, Address to the Knights of Columbus (1915)
Context: The one absolutely certain way of bringing this nation to ruin, of preventing all possibility of its continuing to be a nation at all, would be to permit it to become a tangle of squabbling nationalities, an intricate knot of German-Americans, Irish-Americans, English-Americans, French-Americans, Scandinavian-Americans or Italian-Americans, each preserving its separate nationality, each at heart feeling more sympathy with Europeans of that nationality, than with the other citizens of the American Republic. The men who do not become Americans and nothing else are hyphenated Americans; and there ought to be no room for them in this country. The man who calls himself an American citizen and who yet shows by his actions that he is primarily the citizen of a foreign land, plays a thoroughly mischievous part in the life of our body politic. He has no place here; and the sooner he returns to the land to which he feels his real heart allegiance, the better it will be for every good American. There is no such thing as a hyphenated American who is a good American. The only man who is a good American is the man who is an American and nothing else.