If salvation is all of the Lord, how can faith be a condition for salvation?

It is true some have erred in thinking man, by his free will, independent of God, contributes his own faith, or that the goodness of faith forms a part of the righteousness by which we are legally justified before God, but it is no less true that faith is the God-ordained way for how we receive Christ and his righteousness for salvation, without which we will be damned forever.

A new page of historically reformed resources has been made for help in understanding how faith is a condition and instrument of salvation (per the Westminster standards), and how, by God’s grace, man is a genuine actor therein:

Faith as a Non-Meritorious Condition & Instrument of Justification