I memorized Psalm 103 as a child. When I went to quote it recently, I decided to meditate on it. Iniquities is largely an OT word. My working definition is doing anything independent of the Lord. Verse 3 says, “Who forgives all your iniquities, who heals all your diseases.”
The Holy Spirit took me back to James 3:6. It says, “And the tongue is a fire, a world of iniquity. The tongue is so set among our members that it defiles the whole body…” The Greek word for iniquity is unrighteousness.
Let’s pay attention to verse 2. In the Amplified it says, “For we all often stumble and fall and offend in many things. And if anyone does not offend in speech (never says the wrong things), he is a fully developed character and a perfect man, able to control his whole body and to curb his entire nature.” Perfect means mature.
Isaiah 53:6 says, “All we like sheep have gone astray; we have turned, every one, to his own way; and the Lord has laid on Him the iniquity of us all.”