Happiness of Saints in This Life is Derived From: Trust in God
Source: TTT
Proverbs 16:20
Whoever heeds instruction will find success, and blessed is he who trusts in the LORD.
Philippians 4:6, 7
Be anxious for nothing, but in everything, by prayer and petition, with thanksgiving, present your requests to God. / And the peace of God, which surpasses all understanding, will guard your hearts and your minds in Christ Jesus.