Lucretius De Rerum Natura I.44-49:

omnis enim per se divum natura necessest
immortali aevo summa cum pace fruatur
semota ab nostris rebus seiunctaque longe;
nam privata dolore omni, privata periclis,
ipsa suis pollens opibus, nihil indiga nostri,
nec bene promeritis capitur nec tangitur ira.

Translating freely:

The nature of the gods must of itself
Enjoy its endless life in perfect peace,
Remote from human deeds in its own realm.
But, freed from misery and painful cares,
It thrives by its own force and not by ours,
Never seeking gains, nor ever enraged.