There is nothing in the definition of "pistis" that demands physical action. The two meanings given in the Strong's are "faith" and "faithfulness". You wish to add your meaning to the word, but your meaning is not there.
The definition of "pistis" is faith and faithfulness. And the biblical definition of faith includes action. As you said, if there is no action then there is no faith.
You said: The action demanded here is not just a heart action, but is "having faith in Him who justifies"
You are wrong, this IS ONLY a heart action. GOD IS THE ONE WHO ACTS in sending Jesus to die for our sins and to justify us.
You are partially correct. Jesus' action in living a perfect life and then dying and resurrecting Himself (through the Spirit) are the actions that save us. But as with every person in the OT who received a gift/blessing from God, we must do what He said leads to/results in receiving His gift, or we don't receive it.
You mention examples of men and women who acted on their faith in Hebrews 11. You are correct. First they had faith - with NO actions. Second they acted on that faith - with actions.
Their faith is shown IN their actions. As James says, their actions are the soul of their faith that gives life to it. Without action faith doesn't exist.
Hebrews 11:1 The NASB translation here is NOT incorrect. "Assurance" and "conviction" are taken directly from the Strong's Concordance of the Greek dictionary - #'s 5287 and 1650. However, even if you put "substance" and "evidence" in the verse, it still requires NO action other than an "action" of the heart.
Not true. Substance is something that can be held and/or felt. Evidence is something that can be seen and shown to others. This is not just a mental process, or an "action of the heart"; it is physical action in obedience to the commands of God.
The first obedience required by Jesus is to "repent" and "believe". Jesus said, "This is the work of God, that you (confess Me as Lord and get baptized? - No!) believe in Him whom He has sent."
And again, the word "believe" here is "pistis", so the English word should not be "believe" but "have faith" in Hi whom He sent.
The Jews asked Jesus what work they should do to work the works of God? Jesus' answer? Believe! Paul calls it the obedience of faith. There are NO works required here - other than works of the heart.
You keep trying to make faith just a mental exercise, but it is not. Faith requires physical action or it is not real/doesn't exist/is dead. This is evidenced in Rom 10:9-10 which says clearly and explicitly that a physical action (confessing Jesus as Lord with the mouth) results in salvation being received.
There are NO works or physical actions given in the Bible that lead to salvation - only works of the heart. Romans 10:9-10 are a kind of "litmus test", confirming that one is already saved under the New Covenant,
The result cannot come before the thing that brings about the result. Confession of Jesus as Lord results in receiving salvation, so it MUST come before salvation is received. It is not evidence that salvation has been received.
just like Romans 10:5 refers to a man under the Old Covenant who is already godly and who practices the righteousness based on law.
NO ONE is already righteous. Rom 10:5 does NOT say that the man under the OT was already Godly. Their righteousness was based on the Law, and that the person who does what is in the Law will live by the Law.
Both are seasoned believers, not new believers - therefore good works follow their salvation - they do NOT preceed their salvation.
Yes, "good works" follow salvation.
But repentance from sin does not follow salvation, it leads to receiving salvation (Acts 3:19).
And confession of Jesus does not follow salvation, it results in receiving salvation (Rom 10:9-10).
And baptism (in water) does not follow salvation, it saves us (1 Pet 3:21).
It is clear from scripture that we must "hang on" to our salvation BY FAITH, by hanging on to the gospel message, because if we don't, it can slip away. Paul said,
"Now I make known to you, brethren, the gospel which I preached to you, which also you received, in which also you stand, by which also you are saved, IF YOU HOLD FAST the word which I preached to you, UNLESS YOU BELIEVED IN VAIN.
Hebrews 5:9 is NOT saying that obeying God by doing some work leads to eternal salvation. Once again, it's referring to someone who is already saved - hanging on to their eternal salvation by obeying God and "holding fast the word" as Paul said above. Even Jesus in the previous verse had to learn obedience - verse 8.
No, you are reading your preconception into the verse. Jesus is the author of salvation (He did the work by which we are saved, as you said at the beginning of this post), but He gives that salvation ONLY to those who obey Him, not just those who have a feeling, (only) believe in their heart, or say a prayer.
You are the one who uses terms like "a mere mental assent" or "a mere mental exercise", NOT ME. Those are not Biblical words, much less do they describe Biblical faith.
You are correct, they do not depict biblical faith. But that is what you are advocating. Just having mental assent (with no physical action) is not faith.
Those are perverted definitions of faith. Those terms are insults to the Holy Spirit's power, when He grants new birth to those who put their faith in Jesus, and transfers them from the authority of darkness to the kingdom of His Beloved Son. You use the words "mental assent" to suggest that NOTHING happens when we trust Jesus and put our faith in Him.
Not true at all. When we have faith (both mental assent and the actions that go with it), then we receive salvation. Just having mental assent with no action results in NOTHING happening from God's side either.
Being born again, having the Holy Spirit come into us, being forgiven of our sins, and having a new Lord in our lives - IS NOT NOTHING.
You are absolutely correct in that, but none of that happens until and unless we do what He commanded us to do (repent, confess Jesus, and be baptized).