Adams suggests that a believer's concept of morality is founded in their religious belief and that right and wrong are tied to their belief in God; this works because God always commands what believers accept to be right. If God commanded what a believer perceived as wrong, the believer would not say it is right or wrong to disobey him; rather their concept of morality would break down. Michael Austin writes that an implication of this modified divine command theory is that God cannot command cruelty for its own sake; this could be argued to be inconsistent with God's omnipotence. Aquinas argued that God's omnipotence should be understood as the ability to do all things that are possible: he attempted to refute the idea that God's inability to perform illogical actions challenges his omnipotence. Austin contends that commanding cruelty for its own sake is not illogical, so is not covered by Aquinas' defence, although Aquinas had argued that sin is the falling short of a perfect action and thus not compatible with omnipotence. Alternative theories Paul Copan argues from a Christian viewpoint that man, made in God's image, conforms to God's sense of morality. The description of actions as right or wrong are therefore relevant to God; a person's sense of what is right or wrong corresponds to God's. As an alternative to divine command theory, Linda Zagzebski has proposed divine motivation theory, which still fits into a monotheistic framework. According to this theory, goodness is determined by God's motives, rather than by what he commands. Divine motivation theory is similar to virtue ethics because it considers the character of an agent, and whether they are in accordance with God's, as the standard for moral value. Zagzebski argues that things in the world have objective moral properties, such as being lovable, which are given to them through God's perception of them. God's attitude towards something is cast as a morally good attitude. The theory casts God as a good example for morality, and humans should imitate his virtues as much as is possible for finite, imperfect beings. Objections Semantic objections Philosopher William Wainwright considered a challenge to the theory on semantic grounds, arguing that "being commanded by God" and "being obligatory" do not mean the same thing, contrary to what the theory suggests. He used the example of water not having an identical meaning to to propose that "being commanded