There is, then, a natural tendency in the light to blossom out into all forms and types of goodness. 'Fruit' suggests the idea of natural, silent, spontaneous, effortless growth. And, although that is by no means a sufficient account of the process by which bad men become good men, it is an inseparable element, in all true moral renovation, that it be the natural outcome and manifestation of an inward principle; otherwise it is mere hypocritical adornment, or superficial appearance. If we are to do good we must first of all _be_ good. If from us there are to come righteousness and truth, and all other graces of character, there must, first of all, be the radical change which is involved in passing from separateness in the darkness to union with Jesus Christ in the light. The Apostle's theory of moral renovation is that you must begin with the implantation in the spirit of the source of all moral goodness--viz. Jesus Christ--brought into the heart by the uniting power of humble faith. And then there will be lodged in our being a vital power, of which the natural outcome will be all manner of fair and pure things. Effort is needed, as I shall have to say; but prior to effort there must be union with Jesus Christ. This wide, general commandment of our text is sufficiently definite, thinks Paul; for if the light be in you it will naturally effloresce into all forms of beauty. Light is the condition of fruitfulness. Everywhere the vital germ is only acted upon by the light. No sunshine, no flowers; darkness produces thin, etiolated, whitened, and feeble shoots at the best. Let the light blaze in, and the blanched feebleness becomes vigorous and unfolds itself. How much more will light be the condition of fruitfulness when the very light itself is the seed from which all fruit is developed. But, still further, mark how there must be an all-round completeness in order that we shall fairly set forth the glory and power of the light of which our faith makes us children and partakers. The fruit 'is in all goodness and righteousness and truth.' These three aspects--the good, the right, the true--may not be a scientific, ethical classification, but they give a sufficiently plain and practical distinction. Goodness, in which the prevailing idea is beneficence and the kindlier virtues; righteousness, which refers to the sterner graces of justice; truth, in which the prevalent idea is conformity in action with facts and the conditions of man's life and entire sincerity--these three do cover, with sufficient completeness, the whole ground of possible human excellence. But the Apostle widens them still further by that little word _all_.