Paul said, in Acts 23: 1, that he always followed his conscience.

"Paul stared at the Sanhedrin and said: 'Brethren, I have behaved with a good conscience before God, to this day.

And in 1 Timothy 4: 2, Paul said that a sign of the end times is that people would not follow their conscience:

Surrendering to deceiving spirits and diabolic doctrines, for the hypocrisy of tricksters who have their own conscience marked by fire ...

Good publication at first I thought you would not mention the Holy Spirit but continue reading and was there. He is the one who leads us to all truth. Good publication