Jamieson, Fausset and Brown on Genesis 30:27

27. Laban said ... I have learned--His selfish uncle was averse to a separation, not from warmth of affection either for Jacob or his daughters, but from the damage his own interests would sustain. He had found, from long observation, that the blessing of heaven rested on Jacob, and that his stock had wonderfully increased under Jacob's management. This was a remarkable testimony that good men are blessings to the places where they reside. Men of the world are often blessed with temporal benefits on account of their pious relatives, though they have not always, like Laban, the wisdom to discern, or the grace to acknowledge it.