Men and women, rich and poor, must, with bishops and priests, walk before God in the same wise and holy spirit, in the same denial of all vain tempers, and in the same discipline and care of their souls; not only because they have all the same rational nature and are servants of the same God, but because they all want the same holiness, to make them fit for the same happiness, to which they are all called. It is therefore absolutely necessary for all Christians, whether men or women, to consider themselves as persons who are devoted to holiness and so order their common ways of life, by rules of reason and piety, as may turn it into continual service of God. 

William Law, A Serious Call to a Devout and Holy Life