The reason people do not come to Christ is not because they lack a will, or a mind, or feelings, or even lack opportunity and occasion. Their not coming to Christ is due to their moral and spiritual refusal to do so, a refusal in which they willingly and freely delight. If they cannot come it is not because God will not let them. It is because it is their nature not to want to come. In sum, their not coming is not because of a physical defect but because of a moral refusal.
Sam Storms