It's the 6-7 episode. Calvin talks about the knowledge of God revealed in the Scriptures, which are a surer guide and light to us to see and know God.

Here is the CCEL link to read Calvin's institutes for free:

https://ccel.org/ccel/calvin/institutes/institutes.i.html

The edition by McNeil and Battles:

https://www.amazon.com/dp/0664220282?ref=ppx_yo2ov_dt_b_fed_asin_title