John Gills Exposition of the Bible Commentary - Proverbs 30:19
The way of an eagle in the air ,.... And so of any other bird; but this is mentioned, because it flies swiftest, and soars highest: but the way in which it goes is not known, nor can it be seen with the eye; it cuts the air, and passes through it, but leaves no track behind it which may be pointed to, and it may be said, that is the way the eagle took and flew towards heaven out of sight; the way of a serpent upon a rock ; a smooth hard rock; and wonderful it is that it should creep up... read more
Matthew Henry's Complete Commentary - Proverbs 30:18-23
Here is, I. An account of four things that are unsearchable, too wonderful to be fully known. And here, 1. The first three are natural things, and are only designed as comparisons for the illustration of the last. We cannot trace, (1.) An eagle in the air. Which way she has flown cannot be discovered either by the footstep or by the scent, as the way of a beast may upon ground; nor can we account for the wonderful swiftness of her flight, how soon she has gone beyond our ken. (2.) A serpent... read more