On Divine Calls, by Cardinal John Henry Newman

"Such are the instances of Divine calls in Scripture, and their characteristic is this; to require instant obedience, and next to call us we know not to what; to call us on in the darkness. Faith alone can obey them. But it may be urged, How does this concern us now?… For in truth we are not called once only, but many times; all through our life Christ is calling us. He called us first in Baptism; but afterwards also; whether we obey His voice or not, He graciously calls us still. If we fall from our Baptism, He calls us to repent; if we are striving to fulfil our calling, He calls us on from grace to grace, and from holiness to holiness, while life is given us. Abraham was called from his home, Peter from his nets, Matthew from his office, Elisha from his farm, Nathanael from his retreat; we are all in course of calling, on and on, from one thing to another, having no resting place, but mounting towards our eternal rest, and obeying one command only to have another put upon us" (Sermon 2 in John Henry Newman, Parochial and Plain Sermons [London: Longmans, Green, and Co., 1899], 8:22–23).