Real Strength doesn't falter. We respect athletes who do well consistently. Superstars don't make excuses about their poor performance being attributed to being upset or having a tough week.
Strength of character is the same way. God calls us to be good. We don't just do some good things every once in awhile and call ourselves good. It's about our character; it is the things that we do everyday. That is strength of character. Who are you when no one is watching? Following Jesus means that we are loving to all people and not just the people we like it. We are joyful and in peace even when our situation is difficult because we know that the God of the universe is in control. When we are strong in our character, our actions will be a lot easier to control. The choices we make will be in line with God's will.
But the fruit of the Spirit is love, joy, peace, forbearance, kindness, goodness, faithfulness, gentleness and self-control. Against such things there is no law. Gal. 5:22-23