2 Tim. 2:1-7 (ESV)
You then, my child, be strengthened by the grace that is in Christ Jesus,  and what you have heard from me in the presence of many witnesses entrust to faithful men who will be able to teach others also.  Share in suffering as a good soldier of Christ Jesus.  No soldier gets entangled in civilian pursuits, since his aim is to please the one who enlisted him.  An athlete is not crowned unless he competes according to the rules.  It is the hard-working farmer who ought to have the first share of the crops.  Think over what I say, for the Lord will give you understanding in everything.
Be strengthened by the grace that is in Christ Jesus. We all want to make ourselves stronger. Often we think we can be stronger Christians, if we just… The list that comes after just is a long one. It is often the byproduct of navel gazing. Too many associate being a good Christian with how a person lives. I’m not going to say that there isn’t a certain manner of life that we should aspire too. I am going to say though that it often has very little to do with being a good Christian, as much as these things have to do with being a good person. There is also a trap here. The trap springs when we think we are a good Christian, because we finally mastered a few sins, and are more able to avoid them. One problem here is that we tend to be blind to other sins that have replaced them, sometimes less obvious sins, but sins nonetheless. We start to judge others for not being as good a Christian as we supposedly are. Often times these judgments are not even based on anything biblical. It is our nature, we are all Pharisees by nature, and need to be careful as to where that pharisaical head is popping up in our lives. Believe me it is. We tend to be self-righteous little snobs. This is the end of strengthening yourself, rather than being strengthened by the grace that is in Christ Jesus. Being a Christian isn’t about living the perfect life, I don’t think it is even about trying to live that life, it is about living a forgiven life. Being a good Christian is about constantly returning to the fount of our righteousness, the forgiveness in Jesus Christ. Grace strengthens us. We can, and maybe ought to, exercise our will in daily matters, doing our best to avoid sins we are consciously tempted to. Be we will never become stronger Christians thereby, maybe better citizens, and that is not a bad thing. But the Christian lives on the word of God, the forgiveness of sins found in Jesus Christ.