Listen to this morning's class, "The Joy of Talmud Torah," here. Follow along with the sources here.
For further research:
1) See the various sources that we cited from Pahad Yisshak in their "original": a) Shavuot 6, b) Igerot UMikhtavim 2, c) Hanukkah 6, d) Shavuot 30.