Train up a child in the way he should go and when he is old, he will not depart from it. – Proverbs 22:6

Young Christians do become the best Christians. Early piety is usually eminent piety; so, seek to catch the children while they are young, and train them for the Lord, then they will be ready to serve their generation in their turn. I wish Christians would consider more seriously how the children ought to be looked after by the church. I read the other day of a boy who wished to join in membership with the people of God. His father said that he was too young and kept him back. He was big enough, however, to be sent out to fold the sheep one night. When he came in, his father said, “Jack, have you folded the sheep?” “Yes,” he said; “I folded all the sheep,” laying great stress on the last word. “And did you put the lambs in?” asked his father. “No,” he replied, “I left the lambs outside; they were too young to go in.” “Oh, boy!” said the father; “you know more than I do, after all; they were the very ones that needed most to be folded. You may go and see the minister about joining the church as soon as you like.” If any believers in Christ need specially to be taken into the church, it is those who have come to Jesus in their youth. I pray you, serve your generation by giving the children and young people your most loving attention and care.

Look after the children of this generation for the dangers around them at the present time are almost innumerable…Serve your generation by warning them of their danger and trying to keep them free from the evils by which they are surrounded. Satan gets the advantage over many a young life by causing even right things to be put to wrong uses; and in all sorts of ways, he lays traps for young people. Oh, parents and teachers, do try to give your boys a backbone of moral honesty! Try to show them that they have not come into this world merely to please themselves; that there is something better to be done than that. Do not rest till you have led them to the Saviour, for no boy is safe until he is converted. No girl is safe in the streets of this city till she has a new heart and a right spirit. The times are perilous; yet if we speak a word of warning… ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/2243.cfm