First of all, nothing is impossible with God; and if God is love, he must be reasonable always. I think we can all agree to that, unless you are an atheist.
It's clear that Jesus wants us to be holy, humble, the light of the world, the salt of the earth, and as loving as he is ~ this has to be totally possible or he would not have asked (demanded) of us. If you say "I cannot do it," you are right; but God can do it! With this all settled in your mind, steam full speed ahead with your spiritual growth.