I'm having a little trouble figuring out what you are after, here. Is there something about those two verses that is puzzling you?
John 3:36 "Whoever believes in the Son has eternal life, but whoever rejects the Son will not see life, for God’s wrath remains on them."
"Will not see life" harkens back to quotes and references all through the Bible—particularly in the New Testament—concerning spiritual life. Ever since Adam's disobedience in the Garden, we are spiritually dead, until we are "born again"—born from above, by the Spirit of God. (This is God's doing, and, it is evident that not all people experience it the same way; some may not even know at first that it has happened. Some say things like, "One day I just realized that I believed!")
But John 3:36 expands that fact of being given life by God, which is in THIS temporal existence of ours an "already-but-not-yet" sort of thing, into the eternal life aspect of Salvation. We (believers) are saved during this life, but that life we now to some degree experience will be SEEN when we see Him as He is, in Heaven. HE IS our life. (1 John 3:2)
John 3 begins with Jesus' conversation with the Pharisee, Nicodemus; it is a very well-known passage about being born of the Spirit of God (who is as unaccountable as the wind in this context, does what it does without reference to what people do), and about belief and condemnation, and about spiritual light and darkness. Then Jesus moves on to another place where he was with his disciples and baptized. John the Baptist speaks about Jesus then, and it is my opinion that the rest of that chapter (verses 31-36) is also John the Baptist speaking. It could have been John the apostle, to whom the Gospel of John is attributed, adding his own commentary after quoting John the Baptist, and, I suppose, it could have been Jesus—regardless, it is the inspired word of God, and fits the rest of that chapter, and fits the whole book of John.
The apostle John also wrote 1st, 2nd and 3rd John, in my opinion, because they all sound like the same author as wrote John 3, and focus on much the same issue, though different aspects of it. They are worth reading, even if only because they shed light on this verse you are asking about. (Keep any Bible verse in the immediate context and in the context of all of scripture. It is easy to be misled by considering any verse by itself. Scripture always agrees with Scripture; anywhere it seems to contradict it is either a language issue or teaching method or some other such thing, or (more likely) a misunderstanding by the reader.)
Matthew 7:13,14 “Enter by the narrow gate. For the gate is wide and the way is easy that leads to destruction, and those who enter by it are many. For the gate is narrow and the way is hard that leads to life, and those who find it are few."
These verses were not written in English, and in translating, it is hard to make them 'mean' the same thing they do in the Greek. The versions that try to explain often do so to the detriment of plays on words and symbolism and so on that Jesus used. So try to hold any one passage loosely in your mind, and read the Bible voraciously to gain depth behind the single verses that you have questions about.
We know that elsewhere (John 14:6), Jesus said that HE is the WAY, the TRUTH and the LIFE. Nobody can come to the Father (the "Heavenly Father") but by HIM. And in John 10:9, he even uses the same "figure" of the gate through which one goes and is saved.
That few 'find it' is self-evident, I think. However, it is also worth considering it a play on words, in that, as I mentioned, some realize that they now believe, so it is with "finding" The Way. Some say, "Well, yes, but no! It found me!"
Our wills are totally involved in the faith, the desire for Christ, the work of obedience, repentance and thoughts concerning God. But it is not our wills that save us, nor even that drive us to Christ. We believe
because GOD 'gives us to believe' —not because we considered it a practical good idea. We yield our will to him
because GOD made us spiritually alive. "We do so because it is so."