Thus my heart was grieved— I was disturbed with envy and indignation at the prosperity of the wicked. The word rendered a beast, in the next verse, is a term aptly applied in Scripture to one who is wholly taken up with the things before him, and who has no sense of, or regard to things, future and invisible. See Psalms 92:6.
Related Commentaries of Psalms 73:21
Psalms 73:21-22
21 Thus my heart was grieved, and I was pricked in my reins.
22 So foolish was I, and ignorant:c I was as a beast before thee.d