---

1. One of the most remarkable phenomena in chemistry is that which is known as "catalysis," or the "action of presence" — so called because the mere presence of a certain substance among the atoms of another substance produces the most extensive changes upon these atoms; and yet the body thus operating is itself unchanged. Thus, e.g., starch is converted into sugar and gum, at a certain temperature, by the presence of an acid which does not participate in the change. A current of hydrogen gas directed upon a piece of polished platinum will take fire, and yet the platinum will remain completely unaltered. Very many of the most important actions of growth and decay, of life and death throughout the animal and vegetable kingdoms, are produced by this catalytic power. We find illustrations also in the attractions of cohesion and gravitation, in the resemblance of many animals to the soil on which they live, or the objects by which they are surrounded, and in the regional resemblance subsisting between all the plants and animals belonging to one continent and its dependencies. Ascending higher, we find the influence of this principle in the characteristic features of mental, moral, and physical likeness which the inhabitants of a particular district acquire; and in the resemblance so often noticed between the countenances of husband and wife who have lived long together.

2. But it is in the social world that we see the most striking examples. Human beings are unceasingly exerting unconscious influence upon one another, and producing results of the most vital and lasting importance. The very presence of some is like sunshine, while the society of others acts like a dark cloud. We feel at once at our ease in the presence of some people, and awkward and reserved in the presence of others. On a large scale we see the effects of the same law in the conventionalities of life, in fashions, in the enthusiasm of a crowd, in the panics of trade, and in moral epidemics.

3. The hem of Christ's garment was instinct with healing power; and the very shadow of the apostles shed silent virtue on the sick laid by the wayside. And so in a manner is it with Christians still. But this nameless influence is different in different cases. The natural man often shines through the new man, and produces an alien impression. One is morose and bigoted; his very presence acts like an acid. Another is Pharisaically strict, and makes sad the heart that God has not made sad. A third is morbid, oppressed with little fidgety difficulties and trials. All these Christians are, insensibly to themselves, producing an effect upon others quite contrary to what they wish: they are giving a wrong idea of their religion to the world. On the other hand, there are Christians who produce in others a sense of their close relation to God, and breathe around them an atmosphere as healthy and exhilarating as the air on a mountain-top. They give an adequate representation of what Christianity is and does. Note respecting this spiritual catalysis —

I. ITS TRUTHFULNESS. We say of children that they instinctively know those who love them, and go to such at once; while no kind words or sweet looks will allure them to the side of those who are not lovers of the little ones at heart. What is this but just the impression which a true character is making upon a heart gifted, by virtue of its simplicity, with an insight unknown to the wise and prudent? So also every one has noticed the fondness of animals for certain persons, and their aversion to others. Every Christian is producing two sets of influences. One is the involuntary influence of his real character; the other is the influence of what he says and does for a special purpose. Now these two currents may be opposed to one another. The character may be saying one thing, the lips and conduct another. But in vain does a man profess to be what he is not. The mask worn for a purpose continually slips aside, and reveals the natural face behind. There is a species of animalcule called Rotifera, living in tufts of mosses, which, when placed under the microscope, is found to be transparent as crystal. You see all its internal organs and the processes of life as you see the works of a watch through the glass. We are like this creature. I may not be able to tell why I think a certain person is not a genuine character, but I have an instinctive feeling that he is not what he pretends to be.

II. ITS CONSTANCY. Not more constantly is the sun shining, or a flower exhaling its fragrance, than the Christian is radiating or exhaling influence from his character upon those around him. What a man voluntarily chooses, says, or does, is only occasional. But what he is — that is necessarily perpetual. I cannot always speak a word for Christ, but I can always live for Him. The voluntary language of what I say or do is spasmodic, and liable to continual interruption; but the language of what I really am is as continuous as my life itself. Just as the leaven, by its mere presence, changes the particles of meal in the midst of which it is hid, so does each human being, by his mere presence, affect for good or evil those with whom he associates.

III. ITS RESPONSIBILITY. This we do not always acknowledge. We are responsible, we say, for the influence that we desire to produce upon others; but for the voluntary effect of our life, we think we are no more responsible than we are for the involuntary beating of our hearts. We cannot, however, thus repudiate our responsibility. For what is our character? The sum of our thoughts, feelings, and actions. This character we ourselves have formed, and while we cannot help the silent influence of our character, when formed, we are responsible for the formation of it. Our very accountability to God rests upon our ability to build up a good character; and if we are judged according to the goodness and evil of our character itself, we may certainly be held responsible for the good or evil influence which, unknown to us, it produces upon others. We cannot live in the world and escape this responsibility, because we cannot live in the world and not exert a moral influence upon others. The radiation of heat from one object to another, the equalisation of temperature, is not more certain in the physical world than the distribution of influence in the moral.

(H. Macmillan, D.D.)

---

---

KJV: For none of us liveth to himself, and no man dieth to himself.

WEB: For none of us lives to himself, and none dies to himself.