Mortification

If you study these Penitent Psalms and speak them you will find this kind of approach. The Psalmist is not complaining about sin being in between him and God. He is  complaining about his physical limitations and the work of sin as a result. And this is described as being trapped in some way. You know there this righteous road which is the total communication of Gods word by which He protects us and rules the earth. The opposition to this is what the bible describes as a scheme. To make this short its all the schemes of men from the beginning of the world who have been cursed. The world is going in a direction that is opposed to God and we face being trapped in a scheme. You will see this approach in the Penitent complaint.
Mortification or killing the communication of evil is how we survive in this war so to speak. You see the Psalmist complain about a physical limitation and then he feels how sinful he is. So its facing opposition and being prevented in some way from proceeding on this road. Or having this new language overcome the opposition.
You will find this in your own life. You get going and your succeeding in the purpose that God made for you and then you face a trial. Some circumstance or some physical ailment and you are prevented from being as successful...your life slows down ..sometimes you are forced to be in bed.
The reason that we cannot fail in these circumstances is that we do not fight against the kingdom of darkness through physical attrition. We fight through prayer and meditation So we can be prevented and seem to be useless to man but because we have more time to curse, petition. etc we actually are using our time to promote Gods purposes as He is pleased. Some old lady who is bed ridden is moving the events of the world. lol This is basically the approach of these Penitent Psalms.