And now the whole world of creatures born alive, and things that grow, revolves in sevens. The first-born princes of the angels, who have the greatest power, are seven. The mathematicians also say that the planets, which perform their course around the earth, are seven; by which the Chaldeans think that all which concerns mortal life is effected through sympathy, in consequence of which they also undertake to tell things respecting the future. And of the fixed stars, the Pleiades are seven. And the Bears, by the help of which agriculture and navigation are carried through, consist of seven stars. And in periods of seven days the moon undergoes its changes. In the first week she becomes half moon; in the second, full moon; and in the third, in her wane, again half moon; and in the fourth she disappears. Further, as Seleucus the mathematician lays down, she has seven phases. First, from being invisible she becomes crescent-shaped, then half moon, then gibbous and full; and in her wane again gibbous, and in like manner half moon and crescent-shaped. “On a seven-stringed lyre we shall sing new hymns,” writes a poet of note, teaching us that the ancient lyre was seven-toned. The organs of the senses situated on our face are also seven--two eyes, two passages of hearing, two nostrils, and the seventh the mouth. And that the changes in the periods of life take place by sevens, the _Elegies of Solon_ teach thus: “The child, while still an infant, in seven years, Produces and puts forth its fence of teeth; And when God seven years more completes, He shows of puberty’s approach the signs; And in the third, the beard on growing cheek With down o’erspreads the bloom of changing skin; And in the fourth septenniad, at his best In strength, of manliness he shows the signs; And in the fifth, of marriage, now mature, And of posterity, the man bethinks; Nor does he yet desire vain works to see. The seventh and eighth septenniads see him now In mind and speech mature, till fifty years; And in the ninth he still has vigour left, But strength and body are for virtue great Less than of yore; when, seven years more, God brings To end, then not too soon may he submit to die.”