Do not fret because of evil men or be envious of those who do wrong;  for like the grass they will soon wither, like green plants they will soon die away.

I know that sometimes it's really hard not to do something wrong or that occasionally it's really easy to envy someone who is sinning. And sometimes we say 'It's really hard to follow God's path and do what he wants me to do.'  But really, if we give ourselves to God, we'll find that it's really not that hard at all.

"For my yoke is easy and my burden is light."

Besides, ther's no reward in doing wrong exept withering away like grass. And who would want that?