Adh-Dhahabee said:

Trustworthiness is a portion of the deen (piety), and precision is included in proficiency; so what a haafidh really needs, is to be:

Fearful (of Allaah), intelligent, grammatical, a linguist, righteous, modest, Salafee, and it is sufficient enough for him to write two hundred volumes, and to gather five hundred reliable compilations (books), and not to become fatigued seeking knowledge until death, with sincerity and humility, otherwise let him not trouble himself.

Etiquette of Seeking Knowledge, Bakr Aboo Zayd