I've read in an article that the Steipler Gaon, Rav Yaakov Yisrael Kanievsky zt"l wrote:
I’ve seen many who were thought in their youth to be incapable of succeeding, yet over time they grew to have a solid knowledge of most of Shas and a luminous understanding of halachah.
This first quote seems to be taken from one of his seforim, Karyana D’Igarta 1:21.
The second quote, this time taken from his sefer Chayei Olam 2:12 reads:
he tells the story of a 17-year-old who presented himself before the Chasam Sofer, never before having learned Torah. But the young fellow had a strong desire to do so, and the Chasam Sofer paired him up with several of his talmidim. At first, he failed miserably, incapable of grasping a mishnah, even after learning it a hundred times in a row — failing to retain even briefly whatever he did manage to understand. But he held the Torah tight and learned on and on, and eventually grew to become a great talmid chacham and tzaddik
On both Hebrewbooks.org and Otzar Hachochmah, I saw that Chayei Olam only has the volume 1 edition. Karyana D'Igarta, I was not able to find.
Does anyone know where (and if....) these two sources (Chayei Olam 2:12 and Karyana D'Igarta 1:12) can be found online?