We like things to be attainable. We preach the disciplines of the New Testament so that people will attain what God desires. We do stuff. Stuff like going to church, tithing, etc. so we can attain a measure of satisfaction in what we have done.
I am not saying doing stuff is bad. But doing stuff is not enough. Doing stuff is never enough.
I like what David Platt says, although I cannot recall his exact words. The idea is that we don't do stuff expecting God to be pleased with us, are doing is in response to seeing who He is. It is not an obligation, it is an act of love. Like when I come home. Usually my children will shout, "Daddy!" and come up and hug me. A response. But sometimes, they are preoccupied with a TV show or a video game. Then I have to announce myself, and I get a "daddy" out of obligation. It just is not the same.
I want to always stand in amazement of God, but truth is, sometimes I do not. But these times lead me to seeing His grace and my humanity. They show me the beauty of who He is and what He has done for me. I don't want to intentionally fall, just so I can see Him as greater. But when I do fall short, seeing His continuing grace is amazing.