SimchaMinute by Rabbi Avigdor Miller
Happiness is not possible for one who trusts in anything or anyone other than Hashem, for there is no thing which does not have some flaw of weakness (actually, all things are in themselves nothing, and they all are dependent solely on the will of the Creator).
When one trusts in Hashem, he puts his trust in One Who is all-powerful always; and he therefore is happy in the knowledge that his trust is fully justified. Such a man gains also actual happiness. — Praise, My Soul