It is biblical. Or I would not be able to stand.
I can prove it is biblical. You just don't like to hear it.
Most of the time the threshold Calvinists use to establish "proof" comes shy of actually proving the full extent of the doctrine.
Like with total depravity, it is Biblical to say all have sinned and that sin has made us all incapable of saving ourselves. Yet that's not what total inability teaches, so proving that is not enough. What you'd need to prove is that the imago dei was destroyed at the fall rendering men completely incapable of making a decision to follow God.
What does the Bible say?
The mind of man plans his way, But the LORD directs his steps. (Proverbs 16:9)
And this is how it is for each of them, Bible proves depravity Calvinists make it total, Bible proves election Calvin makes it unconditional, Bible shows a sacrifice sufficient for the whole world Calvin limits it to the world of the elect, Bible proves grace Calvin twists it to irresistable.
The refutation can't be seen by Calvinists because they stretch verses and read them in an explicitly Calvinistic fashion truly believing their proof texts are proof.