What does it mean to be a kid at heart?
Childlike vs childish. To me being a kid at heart is being childlike.
To be childlike is dependence and trust in God. C.S. Lewis had an insightful way of saying expressing spiritual truths. He said “when I became a man I put away childish things, including the fear of childishness and the desire to be very grown up.” In other words, growing spiritually means becoming mature without losing the simplicity, trust, and joy of a child’s heart.
Being aChildlike means being dependent and trusting God. Having joy and wonder. Being obedient in love. Children obey not out of pride, but because of love and trust in their parent’s goodness – an attitude that should shape our relationship with God.
Being a child at heart means not pretending to know everything and depending naturally on love and guidance, forgiving easily and finding joy in the simple things.
From Pity to Praise 