Since the days of the Greek philosophers the subject of inspiration and revelation has been fertile theme for discussion and dispute among scholars and theologians. Many different theories have been advanced, and ultimately abandoned as untenable. In its simplest meaning and use, inspiration describes the personal influence of one individual upon the mind and spirit of another. Thus we often say, "That man inspired me." What we are or do under the influence of that intellectual or spiritual impulse is the effect and evidence of the inspiration. Similarly, divine inspiration is the influence of God's spirit or personality upon the mind and spirit of man. It may find expression in an exalted emotional state, in an heightened clarity of mental perception, in noble deeds, in the development of character, indeed in a great variety of ways; but its seat is always the mind of man and its ultimate cause the Deity himself. [Sidenote: _In the Old Testament_] The early Old Testament expression most commonly used to describe inspiration was that _the Spirit of God rushed upon the man_, as it did upon Saul, causing him to burst forth into religious ecstasy or frenzy (I Sam. x. 6, 10), and upon Samson, giving him great bodily strength or prowess in war (Judg. xiv. 6, 19, xv. 14). Skill in interpreting dreams and in ruling was also regarded as evidence that the Spirit of God was in a man like Joseph (Gen. xli. 38); but above all the prophetic gift was looked upon as the supreme evidence of the presence of the Spirit of Jehovah (Hos. ix. 1; Micah ii. 7, iii. 8). The word _spirit_ as thus used in the Old Testament is exceedingly suggestive. It means primarily the breath, that comes from the nostrils. Though invisible to the eye, the breath was in the thought of primitive man the symbol of the active life of the individual. In the full vigor of bodily strength or in violent exercise it came quick and strong; in times of weakness it was faint; when it disappeared, death ensued; the living personality was gone, and only the play remained. The same Hebrew word, _rúach_, described the wind--unseen, intangible, and yet one of the most real and irresistible forces in all the universe. Thus it was a supremely appropriate term to describe the activity of God, as it produced visible effects in the minds and lives of men. In the later Old Testament literature its use was extended, so that to the Spirit of God was ascribed activity in the natural world and in human history. [Sidenote: _Nature of revelation_]