Seeing through a brick wall.

My absolute favorite line from the pen of JRR Tolkein occurs in the Lord of the Rings trilogy and is attributed to Gandalf remarking on the cognitive prowess of a certain frenetic innkeeper.  It goes; "Even old Barliman can see through a brick wall if you give him enough time".
The horrors of unfettered flesh (the consequences of selfishness) must be FULLY comprehended (observed and experienced) before the unfathomable riches of righteousness (the gift of selflessness) may be received and FULLY appreciated.
Our present frame cannot tolerate the extremes of either.  In mercy, Father restrains the evil He created (Isa 45:7, 2Th 2:7).  In grace we receive tokens of the fullness of what lies ahead (1Cor 2:9).
All have been given the gift of selfishness, that in time, each may also receive the gift of selflessness.
It is enough that some have been given the gift of hope now (His Grace is sufficient) to be shared as He gives opportunity.
In time, even old Barliman will see through the brick.