Seneca quote

From Dialogues and Essays:

Shun luxury, shun good fortune that makes men weak and causes their minds to grow sodden, and, unless something happens to remind them of their human lot, they waste away, lulled to sleep, as it were, in a drunkenness that has no end.... Although all things in excess bring harm, the greatest danger comes from excessive good fortune: it stirs the brain, invites the mind to entertain idle fancies, and shrouds in thick fog the distinction between falsehood and truth.