I am adjusting my position. We are to choose to repent, it is something we do. But God also gives repentance, by His divine favor, as an attitude in our heart. It seems to be mutual. Repentance is achieved by us obeying and by God working within us. We respond to the gospel and turn to the Lord in repentance and (simultaneously, prior, or afterwards) God inspires us to be repentant. We obey, God performs.
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We are commanded to choose to repent.
Matthew 4:17
From that time Jesus began to preach, and to say, Repent: for the kingdom of heaven is at hand.
Luke 13:5
No, I tell you; but unless you repent, you will all likewise perish.
Luke 15:10
Just so, I tell you, there is joy before the angels of God over one sinner who repents.
Matthew 11:20
Then he began to denounce the cities where most of his mighty works had been done, because they did not repent.
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God gives repentance.
Acts 5:31
God exalted him at his right hand as Leader and Savior, to give repentance to Israel and forgiveness of sins.
Acts 11:18
When they heard these things, they held their peace, and glorified God, saying, Then hath God also to the Gentiles granted repentance unto life.
II Timothy 2:25
In meekness instructing those that oppose themselves; if God peradventure will give them repentance to the acknowledging of the truth.