that He would grant you, according to the riches of His glory, to be strengthened with might through His Spirit in the inner man, Ephesians 3:16(NKJV)
God lives inside us. So everything of God dwells inside us and every working of God starts and flows from the inside of us.
The Life of God is inside us as a well, and out of our innermost being flow rivers of living water. John 4:14; 7:38.
The Holy Spirit, the same Spirit who raised Jesus from dead has been sent into our hearts to stay forever.
God strengthens us from the inside by His Spirit in us.
You already have unmatched Divine strength in your spirit.
Take advantage of this unlimited strength in you as you look not to the outside how you feel or sense but on the inside.