the nature of hearts

وَٱلْبَلَدُ ٱلطَّيِّبُ يَخْرُجُ نَبَاتُهُۥ بِإِذْنِ رَبِّهِۦ ۖ وَٱلَّذِى خَبُثَ لَا يَخْرُجُ إِلَّا نَكِدًا ۚ كَذَٰلِكَ نُصَرِّفُ ٱلْـَٔايَـٰتِ لِقَوْمٍ يَشْكُرُونَ

And the good land - its vegetation emerges by permission of its Lord; but that which is bad - nothing emerges except sparsely, with difficulty. Thus do We diversify the signs for a people who are grateful.