Everything!!!
For God so loved the world that He sent down a team of angels to assess the situation, prepare a report, and present it at a meeting He chaired with the leaders of the 12 tribes of Israel - where they debated on what's going on, and thought it may be a good idea to just leave the people to rot since they asked for it & brought on themselves whatever was going on. Plus, if they (the "Council of Elders") decided to help out, they'll need to call for another meeting, and probably have to form another sub-committee to decide on what to do...to find the path of least hassle, lest they come up with the difficult decision of whose son should go down & deal with the situation.
Now...for those who are familiar with John 3:16 (For God so loved the world that he gave his one and only Son,that whoever believes in him shall not perish but have eternal life), we know that the above paragraph is not what happened then...but it's unfortunately what we're doing now.
Love is something that should prompt us into action...and it may sometimes call for sacrifice. It's so easy to say "I love you Lord..." What does this "love" require us to do?
"If you love me, you will obey what I command" (John 14:15)
Jesus answered and said to him, "If anyone loves Me, he will keep My word; and My Father will love him, and We will come to him and make Our abode with him. (John 14:23)
"If you keep My commandments, you will abide in My love; just as I have kept My Father's commandments and abide in His love" (John 15:10)
And this is love: that we walk in obedience to his commands. As you have heard from the beginning, his command is that you walk in love (2 John 1:6)
Now we may ask, "what is this great command that we should obey"? The answer to that can be found in Matthew 22:36-40
"Teacher, which is the greatest commandment in the Law?" Jesus replied: " 'Love the Lord your God with all your heart and with all your soul and with all your mind. 'This is the first and greatest commandment. And the second is like it: 'Love your neighbor as yourself.' All the Law and the Prophets hang on these two commandments."