Coming home and having the running up to you "Daddy!" moment (although yes the dog does that too and our daughter is still learning to box out or get knocked over by the dog). The cuddles, the smiles, the silly things they say, the stories, the imaginations, the hugs, experiencing life through their eyes. I could go on and on. As I said everyone is different and that's okay.
While it still obviously doesn’t convince me, I will say this is probably still the best answer anyone has ever given me when I’ve asked. Usually they just say “it’s hard to explain, it just is.”