And the apostles said unto the Lord, Increase our faith. -Luke 17:5

Take care of your faith, my friends; for it’s very often so weak, that it demands all your attention. I do not know whether any of you feel that your faith is too strong; but I never feel mine strong enough. It seems to be exactly strong enough to bear the day’s troubles, but it would not stand cutting in the least degree with the plane. I could not afford to take the least atom off; it is just enough, and no more. As for some of us, our faith is so weak that the least trouble threatens to devour it. The goat passes and nips its tender shoot, the winter chills and freezes it; it is almost ready to die. And my faith very often hangs upon the feeblest thread; it appears ready to expire. Take care of your faith, Christian take care of your faith whatever you leave out of doors of a night, do not leave that little child of faith, whatsoever plant is exposed to the frost, be sure to put faith within. Take care of faith, for it is so weak generally, it needs well to have a good preservation.

Napoleon once said, “I must fight battles, and I must win them: conquest has made me what I am, and conquest must maintain me.” And it is so with the Christian… The Christian must be going onward; for the arrow will mount while still it is in progress, but it stalls the moment the power stops that keeps it aloft. So the apostle said unto the Lord, “increase our faith.” ~ C,H, Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0032.cfm