Constructing a proper and reliable building is possible using a tool called a plumb line. Without such a tool, the builder however well-meaning and sincere, is likely to make serious errors.
Likewise, our lives and beliefs need to be guided by the plumb line of God’s Word. Read Psalm 119:105; 2 Timothy 3:15-17; Amos 7:8.
A popular concept is, “It doesn’t matter what you believe, as long as you are sincere.” However, one must be sincere in believing and doing the right thing.
We have great respect for a man who is so earnestly sincere in his convictions that he is willing to die for them. But sincerity is not sufficient.