1 Thessalonians 2:4
But as we were allowed of God to be put in trust with the gospel, even so we speak; not as pleasing men, but God, which trieth our hearts.
Note 4 at 1Th 2:4: Certainly, one of the reasons the Lord had entrusted the preaching of the Gospel to Paul was because he was not afraid of man. If Paul had been afraid of man, he would have compromised the Gospel for the sake of self-preservation. That would have lessened the power of the Gospel and prevented people from being saved (Ro 1:16).
Likewise today, the Lord has not called us to please others but to please Him who has called us. A true minister of the Gospel is faithful to the Lord, regardless of the reactions of man.
Note 5 at 1Th 2:4: It's hard for us to know the true motives of people's hearts, because we tend to look only on their actions (1Sa 16:7). However, God looks on the heart, or the motives behind the actions. Surely, there have been ministers who, by the world's standards, were very successful but will be exposed as frauds when the Lord reveals the true motives of their hearts.