It is the mark of a false message that it relies on flattery. (See Alma 46: 5; 61: 4; Jacob 7: 4; Mosiah 27: 8; 2 Ne. 28: 22.)
It is the mark of a true message that it calls for repentance. (D&C 6: 9; 11: 9; Mosiah 18: 20; 25: 22.)
Christ's message is always to "repent" and then to "come to Him." (Moroni 7: 34.)
There has never been a bona fide, reliable, infallible source of truth which cannot be compromised in this world. But there has always been a bona fide, reliable, infallible message of truth which does not compromise. It is the message of repentance.