The Imaam said, “And so here I am, having spent my youth’s vigour, the vitality of my middle age, whatever remaining strength I have in my old age, and the greater portion of my free time in the service of this [most] noble knowledge, with an acute craving for examining manuscripts and photocopies [of books], let alone actual printed ones—hardly anything preoccupying me from that as it does other students of knowledge, except for what I have no choice over.
And yet despite that, indeed I, whenever time advances and I grow older, increase in my faith in Allaah’s Statement, “… and of knowledge, you have been given but a little,” [17:85] and in the fact that over time whenever a person gains more knowledge he increases in his awareness of his own ignorance, and that is why, as a lesson for us, Allaah ordered His Prophet ﷺ to say, “And say, ‘My Lord! Increase me in knowledge!’” [20:114] and for that reason one of his supplications ﷺ was, “Oh Allaah! Cause me to benefit from what you have taught me, and teach me what will benefit me, and increase me in knowledge!” [Hasan: Saheehah, 3151]
Al-Kalimut-Tayyib, p. 7-8.