What follows is my provisional translation (in other words, not official or authorized; see here for more) of a Tablet of ‘Abdu’l-Bahá, the original text of which is published in Áhang-i-Badí‘, year 23, nos. 11–12 (Sulṭán–‘Alá’ 125 BE), p. 314.
He is the All-Glorious
Happiness lieth in knowledge, and knowledge in piety, and piety in detachment and contempt for all the vanities of this world. Detachment bringeth the love of God; love demandeth the recitation of verses and prayers, and attraction to those verses refineth one’s character. To be truthful on the path of God, to deal fairly with others, to subdue one’s lower nature, to keep company with the virtuous, to avoid ignorant fools, to show respect to one’s elders and compassion to them that are younger, to counsel one’s friends, to be forbearing with one’s foes, to be generous to the poor, to show kindness to the peoples of the world, and to guide them that have gone astray—this is the greatest felicity, the supreme gift, the imperishable bestowal. Well is it, then, with them that act accordingly.
A typescript of the original Persian text of this Tablet appears below (all punctuation mine).