Supernatural Increase- Watchman Nee
Surely the one fundamental need in our life and service for God is the blessing of God upon it. No other need exists. What do we mean by blessings? Blessing is the working of God where there is nothing to account for his working. For instance, you calculate that a penny should buy a pennyworth. But if you have not paid your penny, and God has given you ten thousand pennyworth, then you have no basis for your calculations.
When five loaves provide food for five thousand and leave twelve baskets of fragments, when, that is to say, the fruit of our service is out of all proportion to the gifts we posses, that is blessing. Or, to be rather extreme, when, taking account of our failures and weaknesses, there should be no fruit at all from our labors, and still there is fruit, that is blessing.
Blessing is fruit out of all relation to what we are, results that are not just the working of cause and effect. Blessing comes when God works wholly beyond our reckoning, for His Names sake.
Watchman Nee; A Table in the Wilderness