That mystery, that mainspring, the greatest secret of all in the New Testament is the secret of godliness. ‘Godliness’ translates a Greek term which means reverence towards God and real communion with him.
Every day, admire him, worship him, keep him in view, think of his love, relate closely to him, listen to him. Don't let a day go by without speaking to him. Come to him for help, praise him, thank him and trust him. Every day, give some moments to thinking of your eternal blessings, the destination of life, even the youngest need to do it. Don't leave it till old age. Look forward to being with him. By these means Christ is in you, the hope of glory. That is the impetus, the secret, the mainspring of righteousness in you. You have got to try to mortify sin, but the power will be with you and in you. Hold on to the mystery of the faith with a pure conscience. Believe it and mean it sincerely. Think of those words, a summary of him, his person, and his work, and the more you value that, the more Christ will be formed in you.