God's Plan Matures Us Slowly

So get rid of your old self, which made you live as you used to—the old self that was being destroyed by its deceitful desires. Your hearts and minds must be made completely new, and you must put on the new self, which is created in God's likeness and reveals itself in the true life that is upright and holy. (Ephesians 4:22-24 TEV)

Although God could instantly transform us, he has chosen to develop us slowly. Jesus was deliberate in developing his disciples, just as God allowed the Israelites to take over the Promised Land "little by little," so they wouldn't be overwhelmed. (Deuteronomy 7:22) He prefers to work in incremental steps in our lives.
Why does it take so long to change and grow up? There are several reasons -

• We are slow learners. We often have to relearn a lesson forty or fifty times to really get it. The problems keep recurring, and we think, "Not again! I've already learned that!"—but God knows better. The history of Israel illustrates how quickly we forget the lessons God teaches us and how soon we revert to our old patterns of behavior. We need repeated exposure.
 

• We have a lot to unlearn. Many people go to a counselor with a personal or relational problem that took years to develop and say, "I need you to fix me. I've got an hour." They naïvely expect a quick solution to a long-standing, deep-rooted difficulty. Since most of our problems—and all of our bad habits—didn't develop overnight, it's unrealistic to expect them go away immediately. There is no pill, prayer, or principle that will instantly undo the damage of many years. It requires the hard work of removal and replacement. The Bible calls it "taking off the old self" and "putting on the new self." (Romans 13:12; Ephesians 4:22-25; Col. 3:7-10, 14) While you were given a brand new nature at the moment of conversion, you still have old habits, patterns, and practices that need to be removed and replaced.
• Growth is often painful and scary. There is no growth without change; there is no change without fear or loss; and there is no loss without pain. Every change involves a loss of some kind: You must let go of old ways in order to experience the new. We fear these losses, even if our old ways were self-defeating, because, like a worn out pair of shoes, they were at least comfortable and familiar.
 

• Good habits take time to develop. Remember that your character is the sum total of your habits. You can't claim to be kind unless you are habitually kind—you show kindness without even thinking about it. You can't claim to have integrity unless it is your habit to always be honest. A husband who is faithful to his wife most of the time is not faithful at all! Your habits define your character.
There is only one way to develop the habits of Christlike character: You must practice them—and that takes time! There are no instant habits. Paul urged Timothy, "Practice these things. Devote your life to them so that everyone can see your progress." (1 Timothy 4:15 GW)

By : Rick Warren
But they that wait upon the Lord shall renew their strength; they shall mount up with wings as eagles; they shall run, and not be weary; and they shall walk, and not faint. (Isaiah 40:31)