NOTE B. See vol. i. p. 103.
THE USE OF THE WORD 'CONSCIENCE.'
There is no word for conscience in the Old Testament. 'The conception,' says Delitzsch (Bibl. Psychology, Clark's trans., p. 160), 'is not yet impressed upon it.' And he accounts for this by quoting, 'The positive law took away its significance from the natural moral consciousness.' The Jews, that is—like other nations at certain stages of their history—lived so constantly under the detailed guidance of a law believed to be divine, that there was not much room for reflection as to the right and wrong of things. For the idea of conscience to develop, the will of God must be less clearly and decisively pronounced as to the details of conduct. There was, however, of course among the Jews, in proportion to their belief in a clear divine law, the consciousness of having done wrong; and on this account a man's 'heart' is described as 'privy to' an offence, and as 'reproaching' or 'smiting' him: see 1 Kings ii. 44, Job xxvii. 6[[1]], 1 Sam. xxiv. 5, xxv. 31, 2 Sam. xxiv. 10. Here is the root of the idea of conscience, i.e. of something in the man behind his surface self, reflecting upon what he has done, a self behind himself acquitting or condemning him, and so anticipating the divine judgement. For, as stated above[[2]], this was in the main the Stoic doctrine of conscience, and it was among them that the idea was first developed. Conscience was conceived of as that in man which lay behind his working self and reflected on his actions after they were done, bringing them into the light of the 'law of nature' or universal divine law for man. There is thus, as it were, in each man a double self, or double consciousness (conscientia), so that one can reflect upon himself, and pass judgement on his own actions.
It is in this sense of a self-judging faculty in all men reflecting on what they have done, anticipating a divine judgement, that the idea of conscience was acclimatized among the Jews. Thus, in Wisdom xvii. 11, we read, 'For wickedness, condemned by a witness within, is a coward thing, and being pressed hard by conscience, always forecasteth the worst lot.' In St. John viii. 9, according to one reading, the Jews are 'convicted by their own conscience.' So St. Paul, in the passage discussed above (ii. 15), seems to distinguish the subsequent reflective 'conscience' from the previous informing reason, 'the effect (equivalent) of the law written in their hearts.' And in most of the passages of the New Testament, this meaning of conscience—the faculty by which we sit in judgement on what we have already done—is sufficient. But sometimes, as also among the Stoics[[3]], the word passes into meaning the positive directing faculty, as when (1 Cor. viii. 10) a man's 'conscience' is said to be 'emboldened' to adopt a new practice, or (Hebr. ix. 14) to be cleansed for positive service. Moreover, though it is an individual faculty (see Rom. ii. 15), and exists primarily to pass judgement on one's own actions only, yet perforce it must also look without and condemn or approve the actions of others (2 Cor. iv. 2, v. 11).
St. Paul also brings into notice that our conscience is a faculty for the condition of which we are responsible. It is not the voice of God, but a faculty capable of reflecting His voice, if it be well guarded. Thus you may have a 'weak' or a 'strong,' i.e. a more or less enlightened, conscience (1 Cor. viii). And a man may 'defile' his 'mind and conscience,' i.e. he may corrupt his moral reason and powers of moral self-judgement (Tit. i. 15). Then the 'conscience' may become hardened and 'seared' (1 Tim. iv. 2), so that 'the light that is in' men becomes itself 'darkness' according to our Lord's warning (St. Matt. vi. 23). And there is nothing which is more necessary at the present day than to remind men that they are not 'safe' because they are not acting against their conscience, unless they are also constantly at pains to enlighten their conscience and keep it in the light, by the help of the best moral thought of their time, the guidance of the Church and the word of God. Our conscience, if it is rightly to reassure us by its witness, must, like St. Paul's conscience, bear its witness 'in the Holy Ghost' (Rom. ix. 1).
With us moderns 'conscience' has generally the wider meaning of the whole practical moral consciousness. It enjoins as well as judges, and is occupied with the present and the future, as well as with the past.
[[1]] In LXX [Greek] ou gàr súnoida emautô átopa práxas.
[[2]] Vol. i. p. 103, n. 2.
[[3]] e.g. when conscience was described by Epictetus as the grown man's inward tutor [pedagogue], which must obviously mean that it is to instruct as well as reprove.