Another reason I don't do resolutions is because I think we typically make them in our own strength. We are well-intended, to be sure, but I believe the reason for failure comes because we have relied on our own strength rather than God's. I believe motivation has to be internal. Success comes when the motivating factor doesn't depend on outside circumstances or strength. I don't believe it has to do with how much determination or will-power one has or doesn't have, either. For me, it comes down to conviction of the Holy Spirit and reliance upon God. Two verses come to mind when I think of New Year's resolutions: Col. 3:17 "Whatever you do in word or deed, do all in the name of the Lord..." and Zechariah 4:6 " ‘Not by might nor by power, but by My Spirit,’ says the Lord..."
New Year's resolutions aren't a bad thing. In fact, most are quite noble. But I want my focus every day of the year to be on what's necessary, which is loving God and obeying Christ. (Luke 10:38-42) When I do that, then I can rest in knowing that those resolutions will be achieved through His strength and will. May this new year of 2014 be blessed with an ever-increasing knowledge of Christ!