Luke 8 verses 4 to 15

Luke 8:4  And when much people were gathered together, and were come to him out of every city, he spake by a parable:

5  A sower went out to sow his seed: and as he sowed, some fell by the way side; and it was trodden down, and the fowls of the air devoured it.
6  And some fell upon a rock; and as soon as it was sprung up, it withered away, because it lacked moisture.
7  And some fell among thorns; and the thorns sprang up with it, and choked it.
8  And other fell on good ground, and sprang up, and bare fruit an hundredfold. And when he had said these things, he cried, He that hath ears to hear, let him hear.
9  And his disciples asked him, saying, What might this parable be?
10  And he said, Unto you it is given to know the mysteries of the kingdom of God: but to others in parables; that seeing they might not see, and hearing they might not understand.
11  Now the parable is this: The seed is the word of God.
12  Those by the way side are they that hear; then cometh the devil, and taketh away the word out of their hearts, lest they should believe and be saved.
13  They on the rock are they, which, when they hear, receive the word with joy; and these have no root, which for a while believe, and in time of temptation fall away.
14  And that which fell among thorns are they, which, when they have heard, go forth, and are choked with cares and riches and pleasures of this life, and bring no fruit to perfection.
15  But that on the good ground are they, which in an honest and good heart, having heard the word, keep it, and bring forth fruit with patience.
Notice that the parable does not speak of anyone losing his salvation. The parable does indicate that there are those who seem to be saved but are actually not saved. These are pictured in verse 13. 

When they hear, they receive the word with joy, and for a while believe, but have no root. So, in time of testing, they fall away. These are the ones who seem to be so “full of the Lord” for a while, perhaps a long while, yet finally “walk away”. They have not lost their salvation. They nad no root, were not rooted in Christ the Savior! Perhaps they said the “sinner’s prayer”, and were assured that they were going to heaven, so they rejoiced and even got enthusiastic about the Christian life, perhaps even began to minister to others. But it only needed a time of testing to reveal their lost condition. 
Though we may be surprised when such an eventuality occurs, we should not let that dictate our understanding of the sovereignty and faithfulness of the Savior. 
For those who are truly saved, no one and no temptation or testing can pluck them out of the Savior’s hands.
John 10:28  And I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of my hand.
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