Psalm 73:17 Meaning

15If I say, I will speak thus; behold, I should offend against the generation of thy children.

16When I thought to know this, it was too painful for me;

17Until I went into the sanctuary of God; then understood I their end.

18Surely thou didst set them in slippery places: thou castedst them down into destruction.

19How are they brought into desolation, as in a moment! they are utterly consumed with terrors.