Since Calvinists further hold that salvation is by grace apart from good works (sola gratia) and since they view making a choice to trust God as an action or work, they maintain that the act of choosing cannot be the difference between salvation and damnation, as in the Arminian scheme. Rather, God must first free the individual from his enslavement to sin to a greater degree than in Arminianism, and then the regenerated heart naturally chooses the good. This work by God is sometimes called irresistible, in the sense that grace enables a person to freely cooperate, being set free from the desire to do the opposite, so that cooperation is not the cause of salvation but the other way around.