Once you understand that the origin of your opinions (passive beliefs) is entrenched deep inside by the force of certain emotional influences

Which in turn make you accept or discard information accordingly, depending on how much they reinforce those opinions (passive beliefs),

Meaning that the bedrock of your opinions is built with what most likely is inaccurate information

You cannot hold them as highly as you did before: neither your opinion nor the passive beliefs.

A mark of this understanding is the absence of compulsion: you stop trying to convince others of the validity of your opinions and beliefs.