"You wonder why God doesn't remove temptation from your life? If He did, you might lean on your strength instead of His grace. A few stumbles might be what you need to convince you: His grace is sufficient for your sin.
"You wonder why God doesn't remove the enemies in your life? Perhaps because He wants you to love like He loves. Anyone can love a friend, but only a few can love an enemy. So what if you aren't everyone's hero? His grace is sufficient for your self-image.
"You wonder why God doesn't alter your personality? You, like Paul, are a bit rough around the edges? Say things you later regret or do things you later question? Why doesn't God make you more like him? He is. He's just not finished yet. Until he is, his grace is sufficient to overcome your flaws.
"You wonder why God doesn't heal you? He has healed you. If you are in Christ, you have a perfected soul and a perfected body. His plan is to give you the soul now and the body when you get home. He may choose to heal parts of your body before heaven. But if he doesn't, don't you still have a reason for gratitude? If he never gave you more than eternal life, could you ask for more than that? His grace is sufficient for gratitude.
"Wonder why God won't give you a skill? If only God had made you a singer or a runner or a writer or a missionary. But there you are tone-deaf, slow of foot and mind. Don't despair. God's grace is still sufficient to finish what he began. And until he's finished, let Paul remind you that the power is in the message, not the messenger. His grace is suffcient to speak clearly even when you don't.
"For all we don't know about thorns, we can be sure of this. God would prefer we have an occasional limp than a perpetual strut. And if it takes a thorn for him to make his point, he loves us enough not to pluck it out.
"God has every right to say no to us. We have every reason to say thanks to him. The parachute is strong and the landing will be safe. His grace is sufficient."
In the Grip of Grace - Max Lucado