" You can could have and should have yourself back into last week … back into the womb. I could have kept Pro by my side, or I should have gone with him. I can go back and make things happen perfectly if I just think about what I should have or could have done. But I didn’t … you didn’t … that’s the way it is. "

― Tamsyn Muir , Gideon the Ninth (The Locked Tomb, #1)