Jesus is trying to teach that when we give we should give willingly, not necessarily because of the excess that we have. Jesus was trying to teach about the generosity of the poor.

Our attitude/motive,amount when giving should not take precedence over what God calls us to do. The poor widow gave her last knowing that when she gave it she would have nothing left. However, Jesus blessed her and from that time on she never went without. This is because oftentimes those who have much only give ougt of their excess not from the generosity of their heart.  

Jesus places rthe commandment to love above that to refrain from evil because Jesus is ofb God, and God is love. In 1st, John,it tells us that we should remember the emssage which we heard from the beginning, which is to love one another. We are not to be evil like Cain who belongd to the evil one and killed hs brother.

As people called to love one another as we love ourselves, then we are aware that we would not willing kill ourself. Therefore if we would not be evil and kill ourself, then we would show love to our neighbor because we love them just as much as we love ourself.

The way we came to understand this commandment to love our neighbor as ourself, was because Jesus through love, laid down his life for us. Just as Jesus did, so too must we lay down our lives for our brothers. This is the epitome of loving our neighbor as we love ourself.

However, we must show this love not only in words, but in our deeds and actions as well. For those who keep this commandment and refrain from evil remain in Christ and Christ in him.