April 23

The father must always endeavour to educate his son and to acquaint him with the heavenly teachings. He must give him advice and exhort him at all times, teach him praiseworthy conduct and character, enable him to receive training at school and to be instructed in such arts and sciences as are deemed useful and necessary. In brief, let him instil into his mind the virtues and perfections of the world of humanity. Above all he should continually call to his mind the remembrance of God so that his throbbing veins and arteries may pulsate with the love of God.

The son, on the other hand, must show forth the utmost obedience towards his father, and should conduct himself as a humble and a lowly servant. Day and night he should seek diligently to ensure the comfort and welfare of his loving father and to secure his good pleasure. He must forgo his own rest and enjoyment and constantly strive to bring gladness to the hearts of his father and mother, that thereby he may attain the good pleasure of the Almighty and be graciously aided by the hosts of the unseen. 
(‘Abdu'l-Bahá, from a Tablet-translated from the Persian; The Compilation of Compilations, Vol. I, Family Life)