Repentance :
2 Timothy 2:25 In meekness instructing those that oppose themselves; if God peradventure will give them repentance to the acknowledging of the truth;
Repentance is “acknowledging of the truth” or at least is the change of mind “to the acknowledging of the truth”. This is obviously a change of mind and turning from deceit to the truth.
Acts 26:20 But shewed first unto them of Damascus, and at Jerusalem, and throughout all the coasts of Judaea, and then to the Gentiles, that they should repent and turn to God, and do works meet for repentance.
1 Thessalonians 1:9 For they themselves shew of us what manner of entering in we had unto you, and how ye turned to God from idols to serve the living and true God;
Repentance in Acts 26:20 and 1 Thessalonians 1:9 could be explained two different ways.
1. If you say that the “and” in “repent and turn to God” is a connector of the same thing or two names of the same thing, as in “God and Father” from 2 Corinthians 11:31; Ephesians 1:3; Ephesians 4:6; and 1 Peter 1:3, then you would define the meaning of repent as turning to God from idols. Obviously, there would be a change of mind before the turning to God.
2. If you say that “repent and turn to God” are different, repentance would still be the change of mind before the turning to God. Then the ‘action’ produced is the turning to God.
To say that repentance produces a change of action implies a requirement of continual action or works.
It is much better to say that the one thing that true repentance produces is the one act of turning from idols and deceit to God and the acknowledging of the truth before believing on Jesus Christ.
Acts 20:21 Testifying both to the Jews, and also to the Greeks, repentance toward God, and faith toward our Lord Jesus Christ.