Psalm 92:4 (KJV)  For thou, LORD, hast made me glad through thy work: I will triumph in the works of thy hands. 

The psalmist extols the LORD with gladness because of what the LORD has done which he marvellous saw. It was an answer to prayer.

The LORD has done something in which he could attribute only to the LORD. He saw and knew that the LORD had acted. He was heartened to know the LORD answers the cry of his heart.

And so he gave thanks in grateful praise – Psalm 92:5 (KJV)  O LORD, how great are thy works! and thy thoughts are very deep. Amen.