In agreement...
Those who are needing to be saved are not required, not able to know spiritual truths.
As far as the Gospel?
Any hack can and will eventually come to know that he is a sinner. That's not spiritual truth.
He can also know by the nature of the creation itself, that there must be a God. Nature teaches that one.
The wrath of God is being revealed from heaven against all the godlessness and wickedness
of people, who suppress the truth by their wickedness, since what may be known about God
is plain to them, because God has made it plain to them. For since the creation of the world
God’s invisible qualities—his eternal power and divine nature—have been clearly seen,
being understood from what has been made, so that people are without excuse. Romans 1:18-20
The Gospel is not the same as teaching regenerate people spiritual truths.
To try to teach spiritual truths to an unregenerate person would be futile.