Sincerity is a costly asset that can comes from the heart that loves and protects, but sometime sincerity can be taken for granted if the opposite heart given to lacks the ability to discern the truth from it.
Some people hate been told the truth and will rather love to be fed with lies that if they later discover it was lies will tagged you the devil.
Brothers and sister just be your self...
Don't force to please those who don't deserve or be thankful of anything.