Adam Clarke on Psalms 111:2

The works of the Lord are great - גדלים gedolim, vast in magnitude; as רבים rabbim signifies their multitude and variety.

Sought out - Investigated, carefully examined.

Of all them that have pleasure therein - By all that delight in them: by every genuine philosopher; every lover of nature; he who traces out the great First Cause by means of his works. And the man that does so will be astonished at the perfections of the Creator, and admire all the operations of his hands.