The thing about Good Friday is that we did -- we do, even -- all the very horriblest things to Him, but He will turn around and say "I love you. Be blessed." He reaches not just past, but through the pride, the selfishness, the ugliness of sin and offers Himself to us.
While we were still sinners, Christ died for us. -- Romans 5:8
Quantum mechanics is mind bending, but it's got nothing on this. Relativity is beautiful, but it's got nothing on this. Because the guy who dreamed up the universe whose description would be the source of so much joy and beauty and incredibly hard work? That guy chose to be incarnated inside the universe He'd created and to take the very hardest route out. For me. For you. For us.
There are not enough words to describe the awe (although many people have done a better job than me!). Better, though, to try and fall short than to refuse to try. A little like the parable of the talents, perhaps.