But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, — Galatians 5:22

Self-control isn't something you manufacture by sheer willpower—it's fruit, and fruit grows. The spirit produces temperance in the believer's life as naturally as a vine produces grapes. You don't white-knuckle your way to holiness; you walk by the spirit, and the fruit appears. It's a slow growth, not an overnight crop, so keep abiding in the vine.