If you have committed a fault against someone and that person is within your reach, go and confess your wrong immediately and get your sin out of the way. If the person you have injured is too far away to go and see him, sit down and write a letter and confess the injury. If you have cheated anyone, send the money - the full amount, with interest.
Work thoroughly in this. Do it now. Putting it off only makes things worse. Confess to God sins committed against God, and to man sins committed against man. Don't think of getting off by dodging a difficult point. Take everything and put it out of the way. In breaking up your stony heart, you must remove every stone and every matted clump of earth.
Don't leave things you think are only little things and then wonder why you don't feel committed to God. The reason will be that your pride has buried something God said you must confess and remove. Don't turn aside for little difficulties; drive the plough straight through them, plough deep and turn up all the ground so that it is soft and well broken up, fit to receive seed and bear fruit and hundredfold.
When you have reviewed your whole history in this way - thoroughly - then go over the ground a second time and give solemn, close attention to it. The things you have written down will suggest other things you have been guilty of. Then go over it a third time, and you will recall other things. And at the end you will remember an amount of your past - even particular actions - that you didn't think you could ever remember. Unless you examine your sins one by one, you can never grasp the amount of your sin. You should go over your life as thoroughly as you would prepare for judgment.
As you go over the lists of your sins, determine to make immediate and entire change. Wherever you find anything wrong, decide at once, by the strength of God, to not sin again in that way. It benefits nothing to examine yourself unless you resolve to change every single wrong you find in attitude or conduct.
If as you attempt to break up your stony heart, you find your mind is dark, look around. You will find there is still some reason why God's Spirit departs from you. You haven't been faithful and thorough. In this process you must be violent toward yourself and apply your mind. With the Bible in front of you, examine your heart until you do feel. Don't expect God to work a miracle for you to break up your stony heart. The labour is to be done by you.
Focus your attention on your sins. You can't look at your sins very long or very thoroughly and see how bad they are without being deeply moved. Experience abundantly proves the benefit of reviewing our lives in this way. Go to work now. Resolve that you won't stop until you find you can pray. You won't ever have the spirit of prayer until you examine yourself and confess your sins and break up your stony heart. You won't ever have the Spirit of God dwelling in you until you unravel you whole history of sin and spread it out in front of God.
If there is this deep work of repentance and full confession, this breaking down before God, you will then have as much of the spirit of prayer as your body can withstand. Few Christians know anything about the spirit of prayer because they never painfully examine themselves, and so they never know what it means to be completely broken in this way.