Adam Clarke on Psalms 112:1

Blessed is the man that feareth the Lord - This seems to be the continuation of the preceding Psalm: there it was asserted that the beginning of wisdom was the fear of the Lord; and here the blessedness of the man who thus fears is stated.

That delighteth greatly - It is not enough to fear God, we must also love him: fear will deter us from evil; love will lead us to obedience. And the more a man fears and loves God, the more obedient will he be; till at last he will delight greatly in the commandments of his Maker.