The Power of Children's Prayer

Hi all,
A friend of mine asked me today if I knew any quotes or readings or talks about the power of a child’s prayer. I couldn’t think of anything offhand, but am wondering if anyone here might know. I know in general that a child’s prayer is powerful, “for the Kingdom of Heaven belongs to such as these” but can’t think of any evangelical or catechetical quotes or sayings about its power or efficacy.

Thanks

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