Hebrews 12:3 says, “For consider Jesus that endured such contradiction of sinners against himself, lest ye be wearied and faint in your minds.”
There is a relationship between the mind, the spirit, and the body. If you start to faint in your mind or emotions, it can make you weary in your body. The only way around weariness is to recharge or renew your spirit each day.
2 Corinthians 4:16-18 —For which cause we faint not; but though our outward man perish, yet the inward man is renewed day by day. For our light affliction, which is but for a moment, worketh for us a far more exceeding and eternal weight of glory; While we look not at the things which are seen, but at the things which are not seen: for the things which are seen are temporal; but the things which are not seen are eternal.
Galatians 6:9 — And let us not be weary in well doing: for in due season we shall reap, if we faint not.