• The Test of Truth - the resistant, hard-hearted wayside soil hearer v15
• The Test of Time - the mixed heart of rocky ground vv16, 17
• The test of Trials and Tribulations - the heart that crowds out Truth and gives place to the weeds and brush of this world vv18, 19
• The Test of Trust - the heart that receives the word and nurtures it v20

Mark 4:1-20 And he began again to teach by the sea side: and there was gathered unto him a great multitude, so that he entered into a ship, and sat in the sea; and the whole multitude was by the sea on the land. 2 And he taught them many things by parables, and said unto them in his doctrine, 3 Hearken; Behold, there went out a sower to sow: 4 And it came to pass, as he sowed, some fell by the way side, and the fowls of the air came and devoured it up. 5 And some fell on stony ground, where it had not much earth; and immediately it sprang up, because it had no depth of earth: 6 But when the sun was up, it was scorched; and because it had no root, it withered away. 7 And some fell among thorns, and the thorns grew up, and choked it, and it yielded no fruit. 8 And other fell on good ground, and did yield fruit that sprang up and increased; and brought forth, some thirty, and some sixty, and some an hundred. 9 And he said unto them, He that hath ears to hear, let him hear. 10 And when he was alone, they that were about him with the twelve asked of him the parable. 11 And he said unto them, Unto you it is given to know the mystery of the kingdom of God: but unto them that are without, all these things are done in parables: 12 That seeing they may see, and not perceive; and hearing they may hear, and not understand; lest at any time they should be converted, and their sins should be forgiven them. 13 And he said unto them, Know ye not this parable? and how then will ye know all parables? 14 The sower soweth the word. 15 And these are they by the way side, where the word is sown; but when they have heard, Satan cometh immediately, and taketh away the word that was sown in their hearts. 16 And these are they likewise which are sown on stony ground; who, when they have heard the word, immediately receive it with gladness; 17 And have no root in themselves, and so endure but for a time: afterward, when affliction or persecution ariseth for the word’s sake, immediately they are offended. 18 And these are they which are sown among thorns; such as hear the word, 19 And the cares of this world, and the deceitfulness of riches, and the lusts of other things entering in, choke the word, and it becometh unfruitful. 20 And these are they which are sown on good ground; such as hear the word, and receive it, and bring forth fruit, some thirtyfold, some sixty, and some an hundred.

Isaiah 6:9, 10 And he said, Go, and tell this people, Hear ye indeed, but understand not; and see ye indeed, but perceive not. 10 Make the heart of this people fat, and make their ears heavy, and shut their eyes; lest they see with their eyes, and hear with their ears, and understand with their heart, and convert, and be healed.

1Thessalonians 2:13 For this cause also thank we God without ceasing, because, when ye received the word of God which ye heard of us, ye received it not as the word of men, but as it is in truth, the word of God, which effectually worketh also in you that believe.