When
Acts 21:14
And when he would not be persuaded, we ceased, saying, The will of the Lord be done.
was stedfastly minded
Acts 2:42
And they continued stedfastly in the apostles' doctrine and fellowship, and in breaking of bread, and in prayers.
Ephesians 6:10
Finally, my brethren, be strong in the Lord, and in the power of his might.