Total depravity, here is how God describes the concept.
Genesis 8
20 Then Noah built an altar to the Lord, and took of every clean animal and of every clean bird, and offered burnt offerings on the altar. 21 And the Lord smelled a soothing aroma. Then the Lord said in His heart, “I will never again curse the ground for man’s sake, although the imagination of man’s heart
is evil from his youth; nor will I again destroy every living thing as I have done.
And God also says, if you sin against one part of His LAW, you are guilty of all the LAW
James 2:10
For whoever shall keep the whole law, and yet stumble in one
point, he is guilty of all.
And that means death in the lake of fire.
So our only way forward is by His grace to be saved. There is no other way of salvation.
Ephesians 2
4 But God, who is rich in mercy, because of His great love with which He loved us,
5 even when we were dead in trespasses, made us alive together with Christ
(by grace you have been saved),
All other verses must be understood in refence to this truth.
John 1:16
And of His fullness we have all received, and grace for grace.
John 1:17
For the law was given through Moses, but grace and truth came through Jesus Christ.