They were unanimous in regarding ministerial service as mainly pastoral; preaching, administering the sacraments and visiting from house to house; and, further, in perceiving that Christian ministers must be also spiritual rulers, not in virtue of any magical influence transmitted from the Apostles, but in virtue of their election by the Church and of their appointment in the name of the Lord Jesus.
It should be noticed, however, that this energy is possessed by the system consisting of the earth and pound together, in virtue of their separation, and that neither could do work without the other to attract it.
In most mechanical systems the working stresses acting between the parts can be determined when the relative positions of all the parts are known; and the energy which a system possesses in virtue of the relative positions of its parts, or its configuration, is classified as "potential energy," to distinguish it from energy of motion which we shall presently consider.
Available kinetic energy is possessed by a system of two or more bodies in virtue of the relative motion of its parts.
Since our conception of velocity is essentially relative, it is plain that any property possessed by a body in virtue of its motion can be effectively possessed by it only in relation to those bodies with respect to which it is moving.
