Never find fault with the absent. - Alexander Pope

For modes of faith let graceless zealots fight, His can't be wrong whose life is in the right.

Pride, where wit fails, steps in to our defence,
And fills up all the mighty void of sense!
If once right reason drives that cloud away,
Truth breaks upon us with resistless day;
Trust not yourself; but your defects to know,
Make use of ev'ry friend — and ev'ry foe.

Some praise at morning what they blame at night,
But always think the last opinion right.
A Muse by these is like a mistress used,
This hour she's idolized, the next abused;
While their weak heads, like towns unfortified,
'Twixt sense and nonsense daily change their side.
Ask them the cause; they're wiser still they say;
And still to-morrow's wiser than to-day.