Job 38:20

That thou shouldest take it to the bound thereof,.... Either darkness, or rather the light; take it as it were by the hand, and guide and direct its course to its utmost bound. This only the Lord can do and does: he has set a tabernacle for the sun, which goes forth at his command as a strong man to run a race; whose going forth is from the end of the heavens, and his circuit unto the ends of it: in which his course is so steered and directed by the Lord, that he never misses his way or errs from it; but keeps his path exactly, as well as knows its rising and setting, its utmost bounds;

and that thou shouldest know the paths [to] the house thereof? from whence it sets out, and whither it returns; see Psalms 19:4. And so the light and darkness of prosperity and adversity, as well as natural light and darkness, are of God, at his disposal, and bounded by him, and therefore his will should be submitted to; which is the doctrine the Lord would teach Job by all this.