Luke 15:6

(in Hom. 34.) But having found the sheep, he returns home; for our Shepherd having restored man, returns to his heavenly kingdom. And hence it follows, And coming he collects together his friends and neighbours, saying to them, Rejoice with me, for I have found my sheep which was lost. (1 Pet. 2:24, Isai. 53.) By His friends and neighbours He means the companies of Angels, who are His friends because they are keeping His will in their own stedfastness; they are also His neighbours, because by their own constant waiting upon Him they enjoy the brightness of His sight. (in Hom. 34.) And we must observe that He says not, "Rejoice with the sheep that is found," but with me, because truly our life is His joy, and when we are brought home to heaven we fill up the festivity of His joy.

The heavenly powers thus are called sheep, because every created nature as compared with God is as the beasts, but inasmuch as it is rational, they are called friends and neighbours.

We may hence understand the extent of our Saviour's kingdom. For He says there are a hundred sheep, bringing to a perfect sum the number of rational creatures subject to Him. For the number hundred is perfect, being composed of ten decades. But out of these one has wandered, namely, the race of man which inhabits earth. But was He then angry with the rest, and moved by kindness only to one? By no means. For they are in safety, the right hand of the Most Mighty being their defence. It behoved Him rather to pity the perishing, that the remaining number might not seem imperfect. For the one being brought back, the hundred regains its own proper form.