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
On our own we cannot accomplish anything, but God promises to be our strength
But now thus saith the LORD that created thee, O Jacob, and he that formed thee, O Israel, Fear not: for I have redeemed thee, I have called thee by thy name; thou art mine. When thou passest through the waters, I will be with thee; and through the rivers, they shall not overflow thee: when thou walkest through the fire, thou shalt not be burned; neither shall the flame kindle upon thee. For I am the LORD thy God, the Holy One of Israel… Isaiah 43:1-3a
God promises to be with you, He says when you pass through the water, He will be with you, when you walk through the fire he will not allow you to be burned, this same Holy God sent His son into the world to give His life for your sins.
“He that spared not his own Son, but delivered him up for us all, how shall he not with him also freely give us all things? Romans 8:32
When He promised to be with you every step of the way He meant it, When He promised to defend you, protect you, and deliver you He meant it. And when He promised to send His son to be the propitiation for your sins He meant it!