Taking A Stand (Taking Charge)

How do we see 'taking a stand' means not catering to any person or persons whose doctrine goes against the Truth? Why is a 'thick skin' necessary for a preacher who preaches the True Gospel of Christ? What is it that causes a sinner to believe?' What part did Timothy's mother and grandmother have in Timothy's discipleship? What is the litmus test for the True doctrine of Christ? Does anything effect a person's standing with God? What causes a 'oneness' in the Faith? What is the crucial point of the Grace of God that can never be left out of the True Gospel?