Isaiah in ecstatic vision beheld this vision of Truth; and his Messianic predictions prove his inspiration; he read the future history of Christian healing, for he was familiar with the Spirit that demonstrates Truth, that anointeth its minister, that bindeth up the broken-hearted, proclaimeth liberty to the captives, and the opening of the prison to them that are bound.
Spirit is a term of wide signification; in Hebrew it is ruach, in Greek, pneuma, — but Spirit is the one living true God, and this is its only definition. In every other instance, the term is used figuratively, as in the following passages of Scripture; the spirit of evil, the spirit of good, the spirit of wisdom and of knowledge, the spirit of prophecy, the spirit of grace and of prayer — familiar spirits, and so on. Poets sing of the spirit of song, the geni of the groves, the spirit of the wind, the spirit of mirth, of sadness, etc. These are all metaphorical terms, and are not the actual definitions of Spirit. Mary Baker Eddy
(Carpenter, Gilbert, Fragments Gathered From Unpublished Items Ascribed to Mary Baker Eddy, p.28)