but it had been made good by grace

And he told them many things in parables, saying: “A sower went out to sow. And as he sowed, some seeds fell along the path, and the birds came and devoured them. Other seeds fell on rocky ground, where they did not have much soil, and immediately they sprang up, since they had no depth of soil, but when the sun rose they were scorched. And since they had no root, they withered away. Other seeds fell among thorns, and the thorns grew up and choked them. Other seeds fell on good soil and produced grain, some a hundredfold, some sixty, some thirty. He who has ears, let him hear.”
-Matthew 13:3-9 
 

Sowing Seeds in a Field, Vincent Van Gogh

"The ground is described as good: not that it was good by nature, but it had been made good by grace. God had ploughed it; he had stirred it up with the plough of conviction, and there it lay in ridge and furrow as it should lie. When the gospel was preached, the heart received it, for the man said, 'That is just the blessing I want. Mercy is what a needy sinner requires.' So that the preaching of the gospel was THE thing to give comfort to this disturbed and ploughed soil. Down fell the seed to take good root. In some cases it produced fervency of love, largeness of heart, devotedness of purpose of a noble kind, like seed which produces a hundredfold. The man became a mighty servant for God, he spent himself and was spent. He took his place in the vanguard of Christ's army, stood in the hottest of the battle, and did deeds of daring which few could accomplish—the seed produced a hundredfold. It fell into another heart of like character;—the man could not do the most, but still he did much. He gave himself to God, and in his business he had a word to say for his Lord; in his daily walk he quietly adorned the doctrine of God his Saviour,—he brought forth sixty-fold. Then it fell on another, whose abilities and talents were but small; he could not be a star, but he would be a glow-worm; he could not do as the greatest, but he was content to do something, however humble. The seed had brought forth in him tenfold, perhaps twentyfold. How many are there of this sort here? Is there one who prays within himself, 'God be merciful to me a sinner'? The seed has fallen in the right spot. Soul, thy prayer shall be heard. God never sets a man longing for mercy without intending to give it."
-C.H. Spurgeon