Anyone who can contemplate quantum mechanics without getting dizzy hasn't understood it.
If quantum mechanics hasn't profoundly shocked you, you haven't understood it yet.
Truth and clarity are complementary.
All rising curves that show unwelcome trends in human affairs will approach infinity if extended far enough, but it is we who dictate the curve and not vice versa.
Anyone not shocked by quantum mechanics has not yet understood it.
One must always do what one really cannot.