In Luke 8:5-15, our Lord Jesus Christ tells the parable of the sower of good seed:
“A sower went out to sow his seed; and as he sowed, some fell on the path and was trampled on, and the birds of the air ate it up. Some fell on the rock; and as it grew up, it withered for lack of moisture. Some fell among thorns, and the thorns grew with it and choked it. Some fell into good soil, and when it grew, it produced a hundredfold.” As he said this, he called out, “Let anyone with ears to hear listen!” Then his disciples asked him what this parable meant. He said, “To you it has been given to know the secrets of the kingdom of God; but to others I speak in parables, so that ‘looking they may not perceive, and listening they may not understand.’ “Now the parable is this: The seed is the word of God. The ones on the path are those who have heard; then the devil comes and takes away the word from their hearts, so that they may not believe and be saved. The ones on the rock are those who, when they hear the word, receive it with joy. But these have no root; they believe only for a while and in a time of testing fall away. As for what fell among the thorns, these are the ones who hear; but as they go on their way, they are choked by the cares and riches and pleasures of life, and their fruit does not mature. But as for that in the good soil, these are the ones who, when they hear the word, hold it fast in an honest and good heart, and bear fruit with patient endurance.
Saint Gregory Palamas (d. 1359AD) comments:
“The Word which brings about the salvation of our souls is analogous to seed. Just as farmers first cultivate the earth with the plough, then sow seed, so must we prepare ourselves beforehand to accept the heavenly seed, by which I mean the word of spiritual teaching. But we are not inanimate, unfeeling earth which is cultivated and sown by others, but living, breathing, rational ground. For that reason we must make ourselves ready by means of repentance. To give you an indication of the starting point of repentance and the cultivation of the soul, it is what those who approached John’s baptism did on their own initiative: ‘They went out’, it says, ‘and were baptized in Jordan, confessing their sins’ (cf. Matt. 3:5-6, Mark 1:5). The confession of sins is the beginning of this cultivation, the start, that is, of repentance and preparation to accept within us the saving seed, the word of God, which is able to save our souls. Ploughing the ground was devised by farmers as a means of extracting wild roots from deep down in the earth, and rendering it capable of receiving our seeds and plants. Confession does exactly this for the reasonable field, our heart. It digs up the evil passions concealed within it and throws them out, making it ready to take in the sacred seeds and suitable to grow a fine harvest of virtues. Just as, after Adam’s transgression, the earth began to bring forth thistles, thorns, and other useless plants (Gen. 3:18), so man’s heart bears shameful and evil passions and thoughts, and the sins which they in turn produce.” (The Homilies, p 460)
(see also my blog Bearing the Cross: Putting Your Hand to the Plough)