And when the mind becomes smooth by unlearning and by digging out all impressions, of good and bad, of right and wrong, then the ground of the heart becomes as cultivated ground, just as the land does after ploughing. All the old stumps and roots and pebbles and rocks are taken off, and it is made into ground which is now ready for the sowing of the seed. But if there are rocks and stones and bricks still scattered there, and still some of the old roots lying there, then it is difficult for the seed to be sown; the ground is not in the condition the farmer wishes it to be.