Thoughts on the Parable of the Sower

A friend and I have been having a sort of intense discussion over the past two days regarding salvation. My friend looks to the parable of the sower and believes that one of the examples represents those who lose their salvation. And, well, here's my attempt at an explanation. First, the parable itself:

...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. (Matt. 13:3-9, ESV)

And now, Jesus' explanation:

Hear then the parable of the sower: When anyone hears the word of the kingdom and does not understand it, the evil one comes and snatches away what has been sown in his heart. This is what was sown along the path. As for what was sown on rocky ground, this is the one who hears the word and immediately receives it with joy, yet he has no root in himself, but endures for a while, and when tribulation or persecution arises on account of the word, immediately he falls away. As for what was sown among thorns, this is the one who hears the word, but the cares of the world and the deceitfulness of riches choke the word, and it proves unfruitful. As for what was sown on good soil, this is the one who hears the word and understands it. He indeed bears fruit and yields, in one case a hundredfold, in another sixty, and in another thirty. (Matt. 13: 18-23)
My interpretation (based on what Jesus says and the word as a whole). Number 2 is our main point of focus.
There are four examples given here:
1. Seeds that fall on the path – These represent unbelievers; their hearts are hardened; they don't receive Christ;
2.Seeds that fall on rocky ground;
3.Seeds that fall on thorns – These are believers who shift their focus from God (where it belongs) to the temporary things in life. They are what I refer to as "baby Christians". They still need "milk", because they haven't grown to a point where they can handle "meat" (Heb. 5:12-14);
4.Seeds that fall on good soil – These are believers who grow and mature in faith and, in turn, witness and share with others.

Number 2 represents false yeses. You may not see it at first, but over time, they may quit attending church altogether or you never see any fruit. That flame you thought you saw dies out quickly, because there is nothing behind it. We may never fully realize how many of these there are until it's too late. I think that the Bible is very clear in the teaching that salvation can't be lost once you've truly accepted it. If you could lose it, we'd all be getting baptized every day and it would be ridiculous after awhile. If you doubt that, read Romans 8. ESPECIALLY read Romans 8:38-39.