"Fear thou not; for I am with thee: be not dismayed; for I am thy God: I will strengthen thee; yea, I will help thee; yea, I will uphold thee with the right hand of my righteousness." (Isaiah 41: 10)
Every prophecy in the Old Testament must be read through the confirmation of the Cross in the New (2 Timothy 2: 15)
This promise means nothing without the right hand and the righteousness of God.
Where do we find these two things? In Christ!
"If ye then be risen with Christ, seek those things which are above, where Christ sitteth on the right hand of God." (Colossians 3: 1)
"18The eyes of your understanding being enlightened; that ye may know what is the hope of his calling, and what the riches of the glory of his inheritance in the saints, 19And what is the exceeding greatness of his power to us-ward who believe, according to the working of his mighty power, 20Which he wrought in Christ, when he raised him from the dead, and set him at his own right hand in the heavenly places, 21Far above all principality, and power, and might, and dominion, and every name that is named, not only in this world, but also in that which is to come:" (Ephesians 1: 18-21)
Regarding righteousness, we find this in Jesus, too:
"But of him are ye in Christ Jesus, who of God is made unto us wisdom, and righteousness, and sanctification, and redemption:" (1 Corinthians 1: 30)
"For he hath made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him." (2 Corinthians 5: 21)
Because Christ is now in you and me and works in us(Colossians 1: 27, 29), because we are in Christ, triumphing in all things (2 Corinthians 2: 14), we have nothing to fear.
Jesus is at the right hand of the Father, where He is our favor, and He is our righteousness, our representatives forevermore.