 Similarly, she thinks that there are features of human life which explain why it is rationally necessary for us to want the virtues. She argues that the virtues can be taken to be as essential to the fulfillment of our desires as are our limbs. Though we may choose to live a life in isolation, or indeed though we may be stranded in involuntary isolation for any of various reasons, we are creatures who can at present anticipate that our attempts at attaining things will happen in a social environment. This means that we are creatures for whom it is a constant fact that our attempts at fulfilling a desire may be interfered with or enhanced by others. We can all expect to profit if our actions instance a practice which is defined by mutual respect and fidelity to promises, and this profit is one we all have reason to want given that our desiring things predictably occurs within a social matrix.