The timelessness of Gods call

I get stuck sometimes thinking that the Old Testament is less important or less relevant than the New. And I even tune out parts of the New Testament, mostly focusing on what Jesus himself said. But over and over people tie the messages of the new testament back to the old (I've even got some examples in here), and some problems are timeless.

Issah 58 is sort of an incrimination and call to action that could have come right from Jesus:

6-9 "Is not this the kind of fasting I have chosen: to loose the chains of injustice and untie the cords of the yoke, to set the oppressed free and break every yoke? Is it not to share your food with the hungry and to provide the poor wanderer with shelter- when you see the naked, to clothe him, and not to turn away from your own flesh and blood? Then your light will break forth like the dawn, and your healing will quickly appear; then your righteousness will go before you, and the glory of the LORD will be your rear guard. Then you will call, and the LORD will answer; you will cry for help, and he will say: Here am I.

It seems easy for us to look at others and ignore them or declare them the enemy, when we are all one family. What I do to another, I do to myself. I cannot criticise the actions of another while ignoring my own selflish ways. If I am to make a difference in the world, I must be doing God's work, not my own.