God reminds us in His Word that He will strengthen us when we are weak, and even increase our vigor.
He gives strength to the weary and increases the power of the weak. (Isa 40:29 NIV)
But those who wait on the Lord shall renew their strength; they shall mount up with wings like eagles, they shall run and not be weary, they shall walk and not faint. (Isa 40:31 NKJV)
And He said to me, “My grace is sufficient for you, for My strength is made perfect in weakness.” Therefore most gladly I will rather boast in my infirmities, that the power of Christ may rest upon me. (2 Cor 12:9 NKJV)
A significant point to remember is that we need to turn to the Lord, and seek His help. We need to focus on Him and His love and goodness in order to access the strength that He is able to give.
When our goal is to live for Jesus and to extend His loving message of forgiveness and salvation to others, we are assured that He is our ever present help. (Ps 46:1)
Finally, my brethren, be strong in the Lord and in the power of His might. (Eph 6:10)
I can do all things through Christ who strengthens me. (Phil 4:13)
It’s good for us to turn to the Lord in times of stress, challenge, or difficulty. When we’re feeling weak, fragile or defenseless, the Lord promises that He is our strength. He will empower and strengthen His beloved, causing us to soar above our circumstances. (Isa 40:31) What a blessed promise!