The writing may be with invisible ink, but it will be legible one day. So, then, all this solemn writing on the heart is done by ourselves. What are you writing? There is a presumption in it of a future retribution, when you will have to read your autobiography, with clearer light and power of judging yourselves. At any rate there is retribution now, which is described by many metaphors, such as sowing and reaping, drinking as we have brewed, and others--but this one of indelible writing is not the least striking.
Sin is graven deep on sinful men's worship.
The metaphor here is striking and not altogether clear. The question rises whether the altars are idolatrous altars, or Jehovah's. If the former, the expression may mean simply that the Jews' idolatry, which was their sin, was conspicuously displayed in these altars, and had, as it were, its most flagrant record in their sacrifices. The altar was the centre point of all heathen and Old Testament worship, and altars built by sinners were the most conspicuous evidences of their sins.
So the meaning would be that men's sin shapes and culminates in their religion; and that is very true, and explains many of the profanations and abominations of heathenism, and much of the formal worship of so-called Christianity.
For instance, a popular religion which is a mere Deism, a kind of vague belief in a providence, and in a future state where everybody is happy, is but the product of men's sin, striking out of Christianity all which their sin makes unwelcome in it. The justice of God, punishment, sinfulness of sin, high moral tone, are all gone. And the very horns of their altars are marked with the signs of the worshippers' sin.
But the 'altars' may be God's altars, and then another idea will come in. The horns of the altar were the places where the blood of the sacrifice was smeared, as token of its offering to God. They were then a part of the ritual of propitiation. They had, no doubt, the same meaning in the heathen ritual. And so regarded, the metaphor means that a sense of the reality of sin shapes sacrificial religion.
There can be no doubt that a very real conviction of sin lies at the foundation of much, if not all, of the system of sacrifices. And it is a question well worth considering whether a conviction so widespread is not valid, and whether we should not see in it the expression of a true human need which no mere culture, or the like, will supply.
At all events, altars stand as witnesses to the consciousness of sin. And the same thought may be applied to much of the popular religion of this day. It may be ineffectual and shallow but it bears witness to a consciousness of evil. So its existence may be used in order to urge profounder realisation of evil on men. You come to worship, you join in confessions, you say 'miserable sinners'--do you mean anything by it? If all that be true, should it not produce a deeper impression on you?
But another way of regarding the metaphor is this. The horns of the altar were to be touched with the blood of propitiation. But look! the blood flows down, and after it has trickled away, there, deep carven on the horns, still appears the sin, _i.e._ the sin is not expiated by the sinner's sacrifice. Jeremiah is then echoing Isaiah's word, 'Bring no more vain oblations.' The picture gives very strikingly the hopelessness, so far as men are concerned, of any attempt to blot out this record. It is like the rock-cut cartouches of Egypt on which time seems to have no effect. There they abide deep for ever. Nothing that we can do can efface them. 'What I have written, I have written.' Pen-knives and detergents that we can use are all in vain.