The Torah principle of bearing fruit begins in the very first chapter of the book of Genesis:
Gen 1:28: “And God blessed them, and God said unto them, Be fruitful, and multiply, and replenish the earth, and subdue it: and have dominion over the fish of the sea, and over the fowl of the air, and over every living thing that moveth upon the earth.”
This principle is carried forward in a spiritual sense into the New covenant by Yeshua’s teaching:
John 15:2: “Every branch in me that beareth not fruit he taketh away: and every branch that beareth fruit, he purgeth it, that it may bring forth more fruit.”
That this is a legitimate thread running through the entire Bible is exemplified by the prophet Isaiah, as he quotes the Almighty as saying:
Isa 55:10-11: “For as the rain cometh down, and the snow from heaven, and returneth not thither, but watereth the earth, and maketh it bring forth and bud, that it may give seed to the sower, and bread to the eater: So shall my word be that goeth forth out of my mouth: it shall not return unto me void, but it shall accomplish that which I please, and it shall prosper in the thing whereto I sent it.”
It becomes apparent by comparing passages like this that fruitfulness, both natural and spiritual, is the result of God’s influence through his creative word. As that word continues to grow in us, we become more fruitful, and hence more useful, to him.