A little pre-school girl was at the doctor's office. When the doctor was listening to the little girl's heart through a stethoscope, he asked her, "Who do I hear in there? Is Donald Duck in there? Is Barney in there?"
The little girl corrected him very seriously: "No! Jesus is in my heart; Barney is on my underwear!"
Even a little child can understand having Jesus come into their hearts. That's what Jesus was talking about when he made this promise: "I will ask the Father, and he will give you another Counselor to be with you forever—the Spirit of truth. The world cannot accept him, because it neither sees him nor knows him. But you know him, for he lives with you … and will be in you. I will not leave you as orphans; I will come to you." John 14:16-18