I have noticed a pattern with many christians that turn the wonderful blessings God has given us in the New Testament into tools. Such as christian fellowship, the gathering of the saints, bible reading, prayer, speaking the truth in love and so on. You see tools are something you use to work with and to get results. Blessings are gifts, or privileges bestowed UPON us. Not something we use to get results, but something we receive for our benefit, or as the Merriam Webster dictionary defines, to confer prosperity or happiness upon.
The way I see it, is that in the New Testament there are lots of benefits and privileges and opportunities for us to be encouraged in Christ. There are lots of directions in the New Testament given by Paul and others that many christians turn into laws and rules, instead of seeing how they will benefit us. Not by striving, not by trying to 'fix' our sinful condition (which by the way is indeed already fixed), but by enjoying the benefit of being encouraged in the truth. And we all know that TRUTH sets people free. I don't think it's freedom when we bind ourselves to these practices as a sort of new form of law.
I believe Paul exhorted the church in the New Testament to live in the freedom Christ brought them. He exhorted us to live as Sons, to live as who we are. To remind us we have been freed from the old sin nature and that we no longer need to submit to that mentality. We can choose to walk in newness of life by the very Spirit of Christ that dwells within. He knew that being unified with other like minded believers would be a benefit to us. I don't think he would refer to it as a tool for sanctification. That puts the focus back on us and what we 'do'. Not on what he has done.
So that said, let's enjoy all of the benefits that we can, there are many to choose from!! Peace to all!!