Nor will a servile imitation of the ancient masters suffice. A mere reproduction, for example, of the Puritan theology would not be suitable in our day; while the truth, which constitutes its essence, remains the same, it must be cast in the moulds of modern thought, and tinged with the hues of modern experience. Engineers surveying for a railway lay down the line level, or as nearly level as the configuration of the surface will permit; but an engineer's level is not a straight line; it is the segment of a circle,--that circle being the circumference of the globe. The line which practically constitutes a level bends downwards continually as it goes forward, following the form of the earth, and at every point being at right angles to the radius. If it were produced in an absolutely straight line, it would, in the course of a few miles, be high and dry above the surface of the earth, and entirely useless for the practical purposes of life. Such would sacred literature become if in blind admiration of the fathers, the children should simply use the old, and not produce the new. As we advance along the course of time, we are, as it were, tracing a circle; and he who would be of use in his generation, must bend his speculations to the time, and let them touch society on the level at every point in the progress of the race. To throw a new contribution into the goodly store does not, therefore, imply a judgment on the part of the writer that the modern theology is better than the ancient. We must make our own: it concerns us and our children that what we make be in substance drawn from the word of God; and in form, suited to the circumstances of the age. Still further, the accumulations of the past should be used by those who inherit them, as a basis on which to build. It is the business of each generation to lay another course on the wall, and so leave the structure loftier than they found it. The Bible, like the world, is inexhaustible; in either department hosts of successive investigators have plied their tasks from the beginning, and yet there is room. Some observations are here submitted, more or less strictly introductory to a treatise on a specific branch of Scriptural exegesis--the Parables of Our Lord. I.--ANALOGY. As the husbandman's first care is neither the fruit nor the tree which bears it, but the soil in which the tree must grow: so an expositor, whose ultimate aim is to explain and enforce the parables of Jesus, should mark well at the outset the fundamental analogies which pervade the works of God, and constitute the basis of all figurative language, whether in human teaching or divine. The Maker and Ruler of the universe pursues an object, and works on a plan. His purpose is one, and he sees the end from the beginning: the variations, infinite in number, and vast in individual extent, which emerge in the details of his administration, are specific accommodations of means to ends.