Of all the causes which conspire to blind Man's erring judgement, and misguide the mind, What the weak head with strongest bias rules, Is PRIDE, the … - Alexander Pope

Be silent always when you doubt your sense;
And speak, though sure, with seeming diffidence:
Some positive, persisting fops we know,
Who, if once wrong, will needs be always so;
But you, with pleasure own your errors past,
And make each day a critic on the last.

Reason's whole pleasure, all the joys of Sense,
Lie in three words, Health, Peace, and Competence.
But Health consists with Temperance alone,
And Peace, oh Virtue! Peace is all thy own.

Where, one step broken, the great scale’s destroyed: From Nature’s chain whatever link you strike, Tenth or ten thousandth, breaks the chain alike.