How do we know children can understand the gospel?

Spurgeon illustrates that children's capacity for understanding the gospel is evident from their ability to grasp spiritual truths at an early age. He argues that if a child is capable of sinning, they are also capable of receiving salvation through faith. Additionally, he cites examples from scripture where young individuals have displayed a sincere faith in God, reinforcing the notion that spiritual understanding is not restricted by age. The simplicity of a child's faith often surpasses that of adults, making them prime candidates for gospel teaching.