He 6:3
We must know the Lord and try to know him. He appeared like the morning light; He will come to us like rain, just like the spring rain that moistens the fields.
Prophet Hosea called on Israel to pursue the knowledge of God, and only by knowing God can we know ourselves better.
The more you know, the more you trust:
Back 1: 12
For this reason, I have suffered these things, but I am not ashamed. Because I know who I trust, and I am convinced that he can keep what I entrusted to him until that day.
When Paul didn't know God, he persecuted the church and hurt believers. After being illuminated by the Lord, he took knowing Jesus Christ as his treasure, and was willing to give up everything for the Lord, taking his suffering for Christ as an honor and entrusting himself to the Lord completely.
Of course, a true Christian has more than the above criteria.