We find the Psalmist here has this confidence w/o a shadow of a doubt, he testified as he meditate how God created us & concluded that we are wonderfully made! He knew exactly that God perfectly made us so well!
You see, If you have doubts about the PRODUCT, it’s an insult to the MANUFACTURER. So as to God!
When you thought that you have a deficiency! are defective! Are faulty! Are insufficient! it’s an insult to God who made us!
WHO MADE YOU? God knows what you’re complaining about, but WHO MADE YOU?
Brethren the ANTIDOTE for having this deficiency minded is to remind ourselves WHO MADE YOU!