Charles Spurgeon, from his devotional, Chequebank of the Bank of Faith.
“Our weakness should be prized as making room for divine strength. We might never have known the power of grace if we had not felt the weakness of nature.
Blessed be the Lord for the thorn in the flesh, and the messenger of Satan, when they drive us to the strength of God.
This is a precious word from our Lord’s own lip. It has made the writer laugh for joy. God’s grace enough for me! I should think it is. Is not the sky enough for the bird, and the ocean enough for the fish?
The All-Sufficient is sufficient for my largest want. He who is sufficient for earth and heaven is certainly able to meet the case of one poor worm like me.
Let us, then, fall back upon our God and his grace…. it is better for us to have God’s strength than our own.”
Spurgeon, of course, was famously plagued with mental health struggles, and you can read some his quotes here.