|No such thing as a small change|
You can 'correct' your own opinions, but only in the light of new knowledge or clarification of existing knowledge, but only if you engage in discourse. There are very few that can arrive at new knowledge, conclusions or opinions on the basis of study or thought in isolation. Isolation engenders dogma and extremism.
Go away. I'm thinking.
I'm presuming that by 'discourse' you also mean reading and scholarly study (not that direct interaction with others is equivalent...but I'd hate to exclude one over the other).
Perhaps a decent analogy is between knowledge and a field or crop -- the seeds must be sown, the soil must be fertilized, the plants must be tended...and eventually harvested. Repeat.
On a more traditional note, one phrase I appreciate and embrace is "the more you learn, the more you realize how little you know".
To coin my own paraphrase:
You can't outrun the horizon.
Something to ponder unless you're a Flat-Earther.