Ecclesiastes 7:9 in the King James Version
Be not hasty in thy spirit to be angry: for anger resteth in the bosom of fools.
Context
8 Better is the end of a thing than its beginning. The patient in spirit is better than the proud in spirit.
9 Don’t be hasty in your spirit to be angry, for anger rests in the bosom of fools.
10 Don’t say, “Why were the former days better than these?” For you do not ask wisely about this.