Luke 8:15
But the seed on good soil stands for those with a noble and good heart, who hear the word, retain it, and by persevering produce a crop — the good soil people have a noble and good heart (kardia kalē kai agathē) — an ideal from Greek moral philosophy that Luke applies to the kingdom. Retain (kateochousin, hold firm) and persevering (en hypomonē, in patience/endurance) communicate the sustained faithfulness that produces fruit. Endurance through the trials that destroyed the rocky-ground faith is the distinctive characteristic.