When I am tired, I love the hymn "He Giveth More Grace" by Annie J. Flint.
He giveth more grace as our burdens grow greater,
He sendeth more strength as our labors increase;
To added afflictions He addeth His mercy,
To multiplied trials he multiplies peace.
When we have exhausted our store of endurance,
When our strength has failed ere the day is half done,
When we reach the end of our hoarded resources
Our Father’s full giving is only begun.
His love has no limits, His grace has no measure,
His power no boundary known unto men;
For out of His infinite riches in Jesus
He giveth, and giveth, and giveth again.