'Unfruitful' in the Bible

“Then [Zion], you will say in your heart,‘Who has borne me these children,Since I have been bereaved of my childrenAnd am barren, an exile and a wanderer?And who has reared these?Indeed, I was left alone;From where then did these children come?’”

“Behold, the days are coming,” says the Lord,“When the plowman shall overtake the one who gathers the harvest,And the one who treads the grapes [shall overtake] him who sows the seed [for the harvest continues until planting time];When the mountains will drip sweet wineAnd all the hills shall melt [that is, everything that was once barren will overflow with streams of blessing].

Our people must learn to do good deeds to meet necessary demands [whatever the occasion may require], so that they will not be unproductive.

For as these qualities are yours and are increasing [in you as you grow toward spiritual maturity], they will keep you from being useless and unproductive in regard to the true knowledge and greater understanding of our Lord Jesus Christ.