Knowing that Christ will come again should make us want to live better lives. Knowing that when Christ comes we will be judged for the good/bad things we did with our lives, it should make us want to do better.
If you don't think Christ will come soon, for some of us is bad because we'll allow satan to make us keep doing bad things and committing sin, therefore knowing that because of Christ 2nd coming we want to try and follow in his footsteps and try and listen for God's voice to help us during tough times as well as good times so that when he does come we will be ready.