Pay attention, Christians, to the "why." Why do you do things? I believe that question is more important, in many ways, than the "what." The reason is this: If the "why" is right (to honor and glorify God), then the "what" will fall into place. Having the "why" right also protects against pride, as we will not be doing things for OUR honor and glory, but only HIS.
Pride is our greatest enemy! Satan uses it time and again to bring godly Christians down and make a mockery of Christianity. When you start to think, "Oh, I seem to have found a nugget of wisdom," or, "Oh, I seem to be actively living my faith now," watch out! These truthful mental statements may lead subtly to other statements that are deceptive and untrue. The next thought may easily be, "It seems not many other Christians know this or do this" (more possible truth)...followed by, WHAM, "I guess I'm doing pretty good. I've achieved a new level of spirituality. I'm doing better than ___."
These thoughts may be mixed with more deception, causing us to feel self-righteous and as though we have not fallen into the sin of pride at all...thoughts like, "It's too bad ___ hasn't discovered this yet. I need to pray for her/him." Truth mixed with a little pride is a dangerous, dangerous thing. It will not only render your works as filthy rags (Is. 64:6), but also destroy your testimony and lead weaker brothers and sisters into an attitude of apathy in their walk. They will reject seeking after righteousness and sanctification because of their fear of becoming prideful like you!
Watch your thoughts, Christian friends. That is where it begins (Prov. 23:7)! When you hear the prideful statements creeping in, repent and recognize your own needy state (Is. 53:6)! Without Him, we can do nothing (John 15:1-11)!