Matthew Poole and continuators on Psalms 49:16

16. Be not thou afraid when one is made rich, when the glory of his house is increased.

(i. e.) Discouraged or dejected. The prosperity of the Sinners, is oft matter of Fear and Dread to good men; Partly, because it enables them to do more Mischief; and Partly, because it shakes their Faith in God's Providence and Promises, and is apt to engender Suspicions in Mens minds, as if God did not Regard the Actions and Affairs of men, and made no difference between the good and the bad, and Consequently all Religion were vain and unprofitable. See Psal. 73. 12, 13.