en_tn_condensed/2pe/01/20.md

Above all, you must understand

"Most importantly, you must understand"

no prophecy of scripture comes from someone's own interpretation

Possible meanings are 1) the prophets did not make their prophecies on their own or 2) people must rely on the Holy Spirit to understand the prophecies or 3) people must interpret the prophecies with the help of the entire Christian community of believers.