Little children believe with their whole person, while adults tend to believe only with their minds. Perhaps this is why Jesus told his disciples that they had to receive the Kingdom of God as a little child. We can relearn as adults to follow our inner light and see the world more truly.
Based on Mark 10:13-16:
People were bringing little children to Jesus in order that he might touch them; and the disciples spoke sternly to them. But when Jesus saw this, he was indignant and said to them, ‘Let the little children come to me; do not stop them; for it is to such as these that the kingdom of God belongs. Truly I tell you, whoever does not receive the kingdom of God as a little child will never enter it.’ And he took them up in his arms, laid his hands on them, and blessed them.
(New Revised Standard Version Bible: Anglicized Edition, copyright © 1989, 1995 National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved worldwide. http://nrsvbibles.org)