Let me begin this sermon by asking what will strike you as a strange question. It may seem to you self-evident what children are, but adults' definitions of children have changed through time. Adults today define children differently from adults in Jesus' day. Think of how adults define children today. Children are long-awaited gifts from heaven.
Children are accidents.
Children are status symbols. Children are delinquents. Children are trend-setters. Children are prodigies. Children are impressionable.