Here are two quotes that I liked a lot from CT's Reflections on conversion.
"You can become a Christian in a moment, but not a mature Christian. Christ can enter, cleanse, and forgive you in a matter of seconds, but it will take much longer for your character to be transformed and molded to his will. It takes only a few minutes for a bride and bridegroom to be married, but in the rough-and-tumble of their home it may take many years for two strong wills to be dovetailed into one. So when we receive Christ, a moment of commitment will lead to a life- time of adjustment. " ~ John Stott, Basic Christianity
"Certain moral changes will take place immediately in the life of the new convert. A moral revolution without will accompany the spiritual revolution that has occurred within. As the evangelists tell us, even the cat will know it when the head of the house is converted. And the grocer will know it too." ~ A.W. Tozer, We Travel an Appointed Way