There so much packed into these two verses. The Hebrew brings out nuances that are amazing.
The Lord God is full of grace, love, compassion and is very slow to get angry. He forgives (Nasa - Strong's H5375) but does not acquit (Naqah H5352). He attends (paqad H6485) to the iniquity of the fathers and how those iniquities affect future generation.
The seeming harshness we see in verse seven is not there in the Hebrew.
God carries away iniquity, transgression and sin but he won't declare something pure that is not pure.
He loves people and is aware of the fall and all the terrible consequences people face. He won't compromise and at the same time He Is full of compassion and truth (manifested as faithfulness).
"Then Moses said, 'I pray You, show me Your glory!'... Then the LORD said, 'Behold, there is a place by Me, and you shall stand there on the rock; and it will come about, while My glory is passing by, that I will put you in the cleft of the rock and cover you with My hand until I have passed by. Then I will take My hand away and you shall see My back, but My face shall not be seen.' " - Exodus 33:18, 21-23 NASB
Moses asked to see God's glory and God showed him His back after He passed by and told him what we first quoted above in verses six and seven.
God goes ahead of us as a forgiving and loving God. As we stand on the Rock we see that. Grace becomes audible and the finished work becomes visible. Jesus has gone before us. We are behind what He has done and our eyes are following His back. God forgives us and we travel in the wake of that forgiveness.