"All of us have become like one who is unclean,
and all our righteous acts are like filthy rags;
we all shrivel up like a leaf,
and like the wind our sins sweep us away." ~ Isaiah 64:6
Our righteousness is worthless before God.
"'These men who were hired last worked only one hour,' they said, 'and you have made them equal to us who have borne the burden of the work and the heat of the day.'
"But he answered one of them, 'Friend, I am not being unfair to you. Didn't you agree to work for a denarius? Take your pay and go. I want to give the man who was hired last the same as I gave you. Don't I have the right to do what I want with my own money? Or are you envious because I am generous?'
"So the last will be first, and the first will be last." ~ Matthew 20:12-16
God is sovereign. He pays the denarius at the end of the day. It is His denarius.
"For it is by grace you have been saved, through faith — and this not from yourselves, it is the gift of God — not by works, so that no one can boast. For we are God's workmanship, created in Christ Jesus to do good works, which God prepared in advance for us to do. ~ Ephesians2:8-10
We are not saved by our works, but to do good works.
"Because God wanted to make the unchanging nature of his purpose very clear to the heirs of what was promised, he confirmed it with an oath. God did this so that, by two unchangeable things in which it is impossible for God to lie, we who have fled to take hold of the hope offered to us may be greatly encouraged.' ~ Hebrews 6:17-18
God doesn't communicate His purpose or promise unclearly: it is our hope. He does not hide His instruction for us by His silence, nor does He obscure it in code requiring logical decryption from the awardees of Ph.D.s in biblical languages and deductive reasoning. His desire is for all to come to repentance, not just the smart people.
Those few are just a handful of verses you'll have to ignore or explain away in scripture in order to teach that we earn our salvation through our obedience.
You see, Jesus earned it through His obedience (Romans 5:19). Our obedience comes from faith in Him (Romans 1:5). And faith itself is God's gift to us (Ephesians 2:8).
There are a lot more verses like that.
But these few are enough.