I suppose Luke, I don’t understand your point. Jesus’ explanation of the parable does not indicate that it was about salvation, but that the parable is meant to explain a secret, a mystery, something hidden, something not obvious that has to do with the kingdom of God.
The parable doesn’t speak of the entire life span as you say. Rather, it notes how we react to the word of God over a period of time. For example, everyone I know has at some time or another been so overwhelmed by worry that they’ve had the joy and peace of the Kingdom chocked out. And I’ve known many people who for a season were hard against God and His word, only to repent later and joyfully recieve Jesus and have lasting fruit of repentance in thier lives. And I’ve seen people whose lives were marked by fear and worry but later received the revelation of the love of God for them and turned around to be people filled with faith and trust in God. The parable isn’t meant to classify people into 4 different groups, but it is meant to call us all to the sober reality that we need to be careful to be receptive to the Word of God. We need to check our hearts to make sure we are being receptive to the word of God, not rejecting because of being hardened against it, not allowing the worries of this life to choke out the love, joy, and peace of the Kingdom from our lives. We need to allow, even work with, the Holy Spirit when He brings the plow into our lives with the intent of breaking up the ground of our heart, embracing brokenness, recognizing our need of God.
When we recieve the word of God into our lives, yes it does produce good fruit, but such is not about us getting into heaven, but about heaven getting into us. In fact, truth brings good into our lives, whether we’re believers in Christ or not. For example, “Don’t be fooled, what a man sows so shall he reap” is a principle that is true and effective whether we have faith in Christ or not. To interpret this parable as a few people getting into heaven and most not getting into heaven is to nullify the power of this passage to call us all to repentance, to call us all to examine ourselves, whether we be really walking in the grace and power of the Lord or not. One could say, “It’s ok, I’m saved, it doesn’t matter that my life is consumed by fear, that I’m not walking in love and grace; all that matters is I’m going to heaven some day.” Of course, I’m exagerating to make a point; the purpose of the parable is to call us all to be careful on how receptive we are to the word of God.
For example let’s say that Jesus really is the savior of all humanity and fully accomplishes the reconciliation of all of creation for the glory of God; and though there are scriptures that evidently state such, many Christians do not accept these passages in faith and instead dismiss them as not really meaning what they say because they just cannot mean that. “All” does not mean “all” in Rom.5:18. “All of creation” in Col.1:20 does not really mean “all of creation”. “All” cannot mean “all” because the certainty of damnation for others is an assumed truth; and thus the “universalist” passages are quickly dismissed.
The parable of the sower is powerful in that it calls all of us to check our hearts and see if we are being receptive to the word of God, or are we quickly dismissing it because it doesn’t line up with our traditions/assumptions. Or do we receive the word, but when persecution comes because of the Word do we give up on it? Or do the worries and cares of this life fill us with fear so much that the love, joy, and peace of the Kingdom are being chocked out? And what can we do to work with the Lord of our hearts to break our hearts so that we are receptive to the Word?