How do we know that salvation is by faith alone?

The doctrine of salvation through faith alone, often referred to as 'Sola Fide,' is a cornerstone of Reformed theology. Romans 4:5 states, 'To the one who does not work but believes in him who justifies the ungodly, his faith is counted as righteousness.' This pivotal scripture clarifies that faith, rather than works, is the channel through which we receive God's justification. Moreover, Acts 4:12 asserts that salvation is found in no one else but Christ, affirming that faith in Him is the sole means to attain eternal life. This belief is further reinforced by the understanding that we are unable to achieve righteousness through our efforts; rather, it is a complete reliance on Christ's finished work on the cross.