20 This coming of the Lord, and the end of the world, were known to the Preacher; who says, Rejoice, O young man, in your youth, and the rest; Therefore remove anger from your heart, and put away evil from your flesh;... and remember your Creator... or ever the evil days come ,.... or ever the sun, and the light, and the moon, and the stars be darkened,.... and they that look out of the windows be darkened; (signifying the faculty of sight;) or ever the silver cord be loosed; (meaning the assemblage of the stars, for their appearance is like silver;) and the flower of gold be broken; (thus veiling the mention of the golden sun; for the camomile is a well-known plant, having many ray-like leaves shooting out round it;) and they shall rise up at the voice of the sparrow, yea, they shall look away from the height, and terrors shall be in the way. What shall they see? Then shall they see the Son of man coming on the clouds of heaven; and they shall mourn tribe by tribe. And what shall come to pass when the Lord has come? The almond tree shall blossom, and the grasshopper shall grow heavy, and the caper-berry shall be scattered abroad. And as the interpreters say, the blossoming almond signifies the departure of winter; and our bodies shall then after the winter blossom with a heavenly flower. And the grasshopper shall grow in substance (that means the winged soul clothing itself with the body,) and the caper-berry shall be scattered abroad (that is, the transgressors who are like thorns shall be scattered).
Source: Catechetical Lectures (New Advent)