Adam Clarke on Luke 8:15

With patience - Rather, with perseverance. The Greek word ὑπομονη, which our translators render patience, properly signifies here, and in Rom 2:7, perseverance. The good ground, because it is good, strong and vigorous, continues to bear: bad or poor ground cannot produce a good crop, and besides it is very soon exhausted. The persons called the good ground in the text are filled with the power and influence of God, and therefore continue to bring forth fruit; i.e. they persevere in righteousness. From this we may learn that the perseverance of the saints, as it is termed, necessarily implies that they continue to bring forth fruit to the glory of God. Those who are not fruitful are not in a state of perseverance.