Grenfell & Hunt introduced this item as 'A letter from a father to his son, giving him good advice, and announcing the dispatch of clothes and money'.
The good advice in question is in lines 9-12:
ὅρα μηδε|νὶ ἀνθρώπων ἐν τῇ οἰκίᾳ προσκρο[ύ]σῃς, ἀλλὰ τοῖς | βιβλίοις σου αὐτὸ μόνον πρόσεχ[ε] φιλολογῶν | καὶ ἀπʼ αὐτῶν ὄνησιν ἕξεις.
"Take care not to offend any of the persons at home,
and give your undivided attention to your books, devoting yourself to learning, and
then they will bring you profit."
An enlarged image can be obtained online.