"It's merely common sense."
There sure is a lot of opposition to the idea.
In order to see the Truth with a captial T, one must be willing to serve the Truth.
If a person is content or complacent with his/her life, wants to keep things as they are, it isn't possible to see reality clearly.
One must be willing to give up - sacrifice - whatever it takes, to see the truth. Truth must be the master, and my preconceptions, wants, desires, and so on must be subordinate. I must be willing to admit that I'm not God and don't know everything. Then God's truth will be revealed, to the degree I am willing to become servant, not Lord.
If one wants to continue to be the lord of his/her own life, to that degree they won't be able to see reality clearly. Only from their own little box-like vantage point, sullied by their own lust, anger, and greed.