From The Duties of Parents —

Fathers and mothers, I charge you solemnly before God and the Lord Jesus Christ, take every pains to train your children in the way they should go. I charge you not merely for the sake of your children’s souls; I charge you for the sake of your own future comfort and peace. Truly it is your interest so to do. Truly your own happiness in great measure depends on it. Children have ever been the bow from which the sharpest arrows have pierced man’s heart. – J. C. Ryle