As a dream when one awaketh; so, O Lord, when {k} thou awakest, thou shalt despise their image.

(k) When you open our eyes to consider your heavenly happiness, we contemn all their vain pomp.

Wesley's Notes

73:20 They awake - Out of the pleasant dream of this vain life. Despise - Thou shalt make them despicable both to themselves and to all others; raise them to shame, and everlasting contempt. Image - All their felicity and glory, which shall be evidently discerned to be, no real or substantial thing, but a mere image or shadow.

Matthew Henry's Concise Commentary

73:15-20 The psalmist having shown the progress of his temptation, shows how faith and grace prevailed. He kept up respect for God's people, and with that he restrained himself from speaking what he had thought amiss. It is a sign that we repent of the evil thoughts of the heart, if we suppress them. Nothing gives more offence to God's children, than to say it is vain to serve God; for there is nothing more contrary to their universal experience. He prayed to God to make this matter plain to him; and he understood the wretched end of wicked people; even in the height of their prosperity they were but ripening for ruin. The sanctuary must be the resort of a tempted soul. The righteous man's afflictions end in peace, therefore he is happy; the wicked man's enjoyments end in destruction, therefore he is miserable. The prosperity of the wicked is short and uncertain, slippery places. See what their prosperity is; it is but a vain show, it is only a corrupt imagination, not substance, but a mere shadow; it is as a dream, which may please us a little while we are slumbering, yet even then it disturbs our repose.