I would agree with everyone here. We don't do good works to get saved, we do good works because we are saved.
For example, a husband has to constantly show his wife that he loves her. If he just marries her and then never speaks to her again and never shows her any acts of kindness, then no one would believe that he ever really loved her to begin with. If he truly loved her, then that love would compel him to action. It wouldn't be something that he would have to force himself to do.
It's the same way with Christians, our love for GOD compels us to love others and to show that love with our actions. By no means does that require Christians to always be nice and to never speak harshly or critically of others, however there should always be an underlying thread of love in whatever we do (tough love is still love, BTW).