For forms of government let fools contest;

Just a reminder:

For forms of government let fools contest;

Whate'er is best administer'd is best:

For modes of faith let graceless zealots fight;

His can't be wrong whose life is in the right.

In Faith and Hope the world will disagree,

But all mankind's concern is Charity:

All must be false that thwart this one great end,

And all of God that bless mankind or mend.

Alexander Pope, Essay on Man, EPISTLE III: Of the Nature and State of Man, With Respect to Society

Or, to quote a South Asia poet I have quoted before:

mazhab thoe buss mazhab-e-dhil hai; baaqee sub gumraahee hai

[the only (true) creed is the creed of the heart; all else is heresy]