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Please consider what the Roman Catholics said about this at Trent, session 6, canon 9:

Canon 9. If anyone says that the sinner is justified by faith alone, meaning that nothing else is required to cooperate in order to obtain the grace of justification, and that it is not in any way necessary that he be prepared and disposed by the action of his own will, let him be anathema.

Denny it is a well known fact that the RCC theology has confused justification and sanctification into some weird mixture of the two. However, when I read say Packer who says:
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Regeneration was a momentary monergistic act of quickening the spiritually dead. As such, it was God's work alone. Sanctification, however, is in one sense synergistic--it is an ongoing cooperative process ins which regenerate persons, alive to God and freed from sin's dominion are required to exert themselves in sustained obedience. God's method of sanctification is neither activism nor apathy, but God dependent effort.J.I Packer Concise Theology page 170

Packer affirms that our cooperation, even though it is powered by God, is in fact a synergistic work.

Peter

If you believe what you like in the gospels, and reject what you don't like, it is not the gospel you believe, but yourself. Augustine of Hippo