(For we walk by faith, not by sight:)2 Corinthians 5:7(KJV)
Justification like sanctification is a gift of grace. The former is God's gift of grace to the unsaved sinner and the latter is God's gift of grace to the saved saint. Both are accessed by faith, and as demonstrated throughout scripture.
Faith is believing all God has said in His Word. Faith accepting scriptural truth as a firm fact. Faith is having assurance that what we hope for in Christ will certainly come to pass - indeed without faith it is impossible to please God
Walking by faith in this life, means we are to rely completely on all that God has said in His Word. The life of faith is filtering our thoughts; actions; attitudes and words through the holy Scriptures, as we listen to the inner promptings of the Holy Spirit; follow His directions and trust in the Lord with all our heart.
We are saved by grace through faith in Christ and we are to walk by faith and not by sight, nor by what we imagine or what we feel. But sadly, many Christians are diverted away from this path of faith to living by sight; by signs; by senses and emotions - by feelings; by worldly philosophies or extra-biblical revelations - especially when they see life's stormy seas and the mountains of difficult circumstances rising up to block their path.
However, the man or woman that lives by faith as well as being saved by faith accepts the truth that God uses all the storms and problems of life, as well as times of great joy and rejoicing to remove all the pride and selfishness of our old sin nature, as He gently conforms us into the beautiful image of the Lord Jesus.
The man or woman who lives by faith uses life's stumbling-blocks as stepping stones. Faith allows obstacles to be changed into opportunities and wounds to become a witness to the generous grace that He pours out into our lives in great abundance - so that we may become healing balm godly and comfort in the lives of others facing similar difficulties.
Living by faith frequently contrasts the visible unreality of this fake, false and failing world with the invisible reality of true; glorious; eternal; heavenly things that are our promised inheritance, in Christ. Happy is the one that understands that faith is not only required for salvation but also the necessary ingredient to live a victorious Christian life. Living by faith simply means that we trust completely in all that God has said in His Word.
Loving Father help me walk by faith, to live by faith, to pray in faith and to trust all that is written in Your Word of truth - by faith. In Jesus name I pray, AMEN.