Posted every second day…

October 24

Deliver my longings and greetings to the consolation of thine eye [1], ……, and to thy younger son, ……. Verily I love them both even as a compassionate father loveth his dear children. As to thee, have for them an abundant love and exert thine utmost in training them, so that their being may grow through the milk of the love of God, forasmuch as it is the duty of parents to perfectly and thoroughly train their children.

There are also certain sacred duties on children toward parents, which duties are written in the Book of God, as belonging to God. The (children’s) prosperity in this world and the Kingdom depends upon the good pleasure of parents, and without this they will be in manifest loss. 
- ‘Abdu’l-Baha  (‘Tablets of ‘Abdu’l-Baha, vol. 2)
[1] “Consolation of the eye”—idiomatic Persian expression meaning “son.”