Holy joy is the life of thankful praise, as thankful praise is the language of holy joy.Question: How well do I know God? Answer: How much do I trust Him?
"Those that know thy name will put their trust in thee, as I have done, and then they will find, as I have found, that thou dost not forsake those that seek thee." The better God is known the more he is trusted. Those who know him to be a God of infinite wisdom will trust him further than they can see him (Job xxxv. 14); those who know him to be a God of almighty power will trust him when creature-confidences fail and they have nothing else to trust to (2 Chron. xx. 12); and those who know him to be a God of infinite grace and goodness will trust him though he slay them,Job xiii. 15. those who know him to be a God of inviolable truth and faithfulness will rejoice in his word of promise, and rest upon that. Those who know him to be the Father of spirits, and an everlasting Father, will trust him with their souls even to the end.
Reading from Matthew Henry's Commentary, Psalm 9: