Faith is exhibited by having a spiritual peace, even in the most difficult of times.

Rom 5:1
Therefore being justified by faith, we have peace with God through our Lord Jesus Christ:

Light from the Word.

Faith is the GIFT of God to a repentant sinner who surrenders to Christ as Lord.

8 For by grace are ye saved through faith; and that not of yourselves: it is the GIFT of God:
9 Not of works, lest any man should boast. (Eph 2:8-9)

That gift of faith includes the INDWELLING of God's Holy Spirit Who clings to us, when we fail to cling to Christ!

13 In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were SEALED WITH that holy Spirit of promise,
14 Which is the earnest of our inheritance until the redemption of the purchased possession, unto the praise of his glory. (Eph 1:13-14)

Faith gives us "peace with God" because we KNOW Who has saved, is saving, and will completely save us!

13 These things have I written unto you that believe on the name of the Son of God; that ye may KNOW that ye have eternal life, and that ye may believe on the name of the Son of God. (1 John 5:13)

And THAT'S why the "just shall LIVE BY his faith!" (Hab 2:4)

Love ya!
Bro. Bruce