Isaac seems to be thinking a lot about things that are beyond the level of a four year.
Isaac: "Mama, how do you love?"
Me: "How do you love?"
Me: "How do you think you love?"
Isaac: "I don't know. How do you love you?"
Me: "I am not sure. I know how to write 'love you.' Do you want to know that?"
Isaac: "Um... (clearly not totally satisfied). Okay. How do you write 'love you.'"
Obviously I am the wrong parent for these questions. Isaac clearly needs some sessions with The Philosopher Mom!