Informing Others One is a Hafiz
Question

                I am a hafiz of the Quran, praise be to Allah. Is speaking of this for the purpose of encouraging others permissible? Or is it something that should be kept secret between a person and his Lord? (i.e. is it better to conceal it?
Praise be to Allah.
    It is 
    permissible for a person to speak of what Allah has blessed him with of 
    knowledge or hifz (memorization of the Quran) if that is done so as to ward 
    off harm or to serve the interests of people, such as if he wants to 
    encourage them to memorize the Quran and seek knowledge, and that is not 
    regarded as the kind of self-praise that is forbidden. Allah tells us that 
    Yoosuf (peace be upon him) said (interpretation of the meaning): 

    “[Yoosuf 
    (Joseph)] said: ‘Set me over the store‑houses of the land; I will indeed 
    guard them with full knowledge” (as a minister of finance in Egypt).’”

    [Yoosuf 
    12:55].

    ‘Abd-Allah 
    ibn Mas’ood (may Allah be pleased with him) said: I recited seventy-odd 
    surahs to the Messenger of Allah (peace and blessings of Allah be upon him) 
    and the Companions of the Messenger of Allah (peace and blessings of Allah 
    be upon him) know that I am the most knowledgeable among them of the Book of 
    Allah. If I knew that anyone was more knowledgeable than me, I would go to 
    him. Narrated by Muslim (4502). 

    Al-Nawawi 
    (may Allah have mercy on him) said, commenting on this hadeeth (narration): 
    This hadeeth shows that it is permissible for a person to mention virtues 
    and knowledge that he has if there is a need for it. 

    With 
    regard to the prohibition on praising oneself, this refers to praising 
    oneself unnecessarily, when the motive is boasting and self-admiration. But 
    prominent people often praise themselves when there was a need, such as to 
    ward off harm thereby or to achieve something that is in the people’s 
    interests, or to encourage them to acquire knowledge from him, and so on. An 
    example of serving the people’s interests is when Yoosuf (peace be upon him) 
    said: “Set me over the store‑houses of the land; I will indeed guard them 
    with full knowledge”, and an example of warding off harm is when ‘Uthman 
    (may Allah be pleased with him) said, when he was under siege that he had 
    supplied equipment to the army that went to Tabuk, and had dug the well of 
    Rumah. And an example of encouragement to others is when Ibn Mas’ood (may 
    Allah be pleased with him) said this (the words quoted above) and when Sahl 
    ibn Sa’d said: There is no one left who has more knowledge of that than me, 
    and when someone else said: You have come to the expert, and so on. End 
    quote. 

    But 
    whenever a person is able to conceal his knowledge, this is better, because 
    his showing it and speaking of it may open the door to the shaytan and cause 
    him to fall into pride and self-admiration. 

    And Allah 
    knows best.