Psalm 16:8 has always been comforting to me. However, it just became even more so when I understood the imagery involved. One commentator has explained that this is military imagery. To be at someone’s right hand infers that the shield a soldier holds is in his left hand. He holds the sword with his right. This means that he is vulnerable to attack on his right side. However, if you have a good partner at your right hand, his shield (held in his left hand) can protect you from attacks coming from that direction. In other words, the Psalmist is saying that God protects you in those very places where you are most vulnerable to attack. This is immensely comforting to me, and should be comforting to all Christians.
This is especially relevant in terms of those sins that are habitual in us, to which we are most prone to fall. We need to stop thinking of God as adversarial to us in this struggle, and start thinking of Him as our greatest (and first!) resource to fight the sin. He is at our right hand. I know that I have had trouble thinking the wrong way about God in these kinds of situations. I am tempted to think of God only as accusatory, or disappointed. Now, God our Father does not like our sin, and He wants it gone from us. And he can be a stern Father, allowing us to face the consequences of our sins for our good through discipline. However, there is more to the situation than that. After all, there must be a reason why these sins are not completely conquered at conversion. There must be a reason why God does not wave a magic wand and all our sin is gone. There are so many layers to our self-reliance that God strips away throughout our Christian lives. A realization that all power to conquer sin comes from God is the goal here. Until we stop thinking of God as a last resort, we will still fall prey habitually to those sins. It is only when we run first to Jesus at the first sign of temptation that we can make any progress in fighting these sins. Run first to your Shield-Mate. When we run away from Him, our entire right side is exposed to the attacks of Satan. It is not wise, but it is all too often what we do.