I. It is universally acknowledged that the circle is the archetype of all forms, physically as well as mathematically. It is the most complete figure, the most stable under violence, the most economical of material; its proportions are the most perfect and harmonious: and therefore it admits of the utmost variety consistent with unity of effect. The universe has apparently been framed according to this type. Nature attains her ends not in a series of straight lines, but in a series of circles; not in the most direct, but in the most roundabout, way.
II. Passing from the physical world to the domain of man, we find there also innumerable traces of the law of circularity. "One generation passeth away, and another generation cometh." Human life is like the wheel which Ezekiel saw in vision. Its aspects and relations, external and internal, are continually changing; one spoke of the wheel is always ascending while another is descending: one part is grating on the ground while another is aloft in the air. Action and reaction is the law of man's life. A season of misfortune is usually followed by a season of success; and when circumstances are most prosperous, a time of reverses is not far off.
III. The first and most prominent doctrine which Christianity teaches is that retrogression is an element of progress. (1) "Repent, for the kingdom of heaven is at hand," was its watchword when it first raised its voice amid the deserts and mountains of Judaea. Repentance is the germinal bud of living Christianity. (2) The afflictions and trials that bring the Christian low contribute in the end to raise him to a higher condition of heavenly-mindedness. (3) Death seems to the eye of sense the saddest and most mysterious of all retrogressions. The wheel is broken at the cistern; the circle of life completes itself, and returns to the non-existence from which it sprang. But the day of death is better than the day of birth, because death is a higher and nobler birth. The grave is an underground avenue to heaven, a triumphal arch through which spiritual heroes return from their fight to their reward, made conquerors, and more than conquerors, through Him that loved them.
H. Macmillan, Bible Teaching in Nature,p. 312.
References: Ecclesiastes 1:4-11. J. Bennet, The Wisdom of the King,p. 60. Ecclesiastes 1:6. F. Schleiermacher, Christian World Pulpit,vol. iii.,p. 5.Ecclesiastes 1:7. H. J. Wilmot-Buxton, Waterside Mission Sermons,2nd series, p. 122; Spurgeon, Evening by Evening,p. 302.