This is just so simple! God uses the WORD to draw people to himself. Therefore, the gospel has to be preached! There is no contradiction here, just a failure to understand the whole Word of God.
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How then will they call on him in whom they have not believed? And how are they to believe in him of whom they have never heard? And how are they to hear without someone preaching? 15 And how are they to preach unless they are sent? As it is written, “How beautiful are the feet of those who preach the good news!” 16 But they have not all obeyed the gospel. For Isaiah says, “Lord, who has believed what he has heard from us?” 17 So faith comes from hearing, and hearing through the word of Christ." Romans 10:14-17
"21 For since, in the wisdom of God, the world did not know God through wisdom, it pleased God through the folly of what we preach to save those who believe." 1 Cor. 1:21
Many evangelists used by God were Reformed, like George Whitfield and Charles Spurgeon. The Bible is quite clear we are to preach the Word of God, and
"it pleased God through the folly of what we preach, to save those who believe"
No one is saying the gospel does not have to be preached. It MUST be preached, then God saves the person, who believes. We do not save ourselves, because that is a works doctrine, and you can never be quite sure if we believed or obeyed enough, if we do it in our own strength.
As for context, it is one of the most important aspects of a grammatical-historical understanding of hermeneutics. Lack of using context is what leads to false doctrines and heresies. The text must be viewed in light of what is in the preceding and the verses that come after the passage. Then in terms of the chapter, the book, the Covenant and the whole Bible. That is the meaning of context!
Here is a good article for you to start your study of how to read and interpret the Bible. Interpret the Bible in light of the Bible, that is the meaning if context. Not cherry picking a few verses out of context, to arrive at false doctrines!
The Eight Rules of Bible Interpretation