We preach salvation in Jesus, we don't know who will be saved.
1 Corinthians 1:21 For after that in the wisdom of God the world by wisdom knew not God, it pleased God by the foolishness of preaching to save them that believe.
Some say "Why do you pray for people to be saved if God fas decided?" I ask the same "Why do you pray for people to be saved if it is down to their own free will?"
I would like to present an account of a prayer for other people that will highlight a prayer for others of why pray that men will get saved. This quote of the prayer of Jesus Christ is on crucifixion eve.
Joh 17:5 And now, O Father, glorify thou me with thine own self with the glory which I had with thee before the world was.
:6 have manifested thy name unto the men which thou gavest me out of the world: thine they were, and thou gavest them me; and they have kept thy word.
7 Now they have known that all things whatsoever thou hast given me are of thee.
The word "for" is a conjunction in the English language building on and explaining what has already been said.
8 For I have given unto them the words which thou gavest me; and they have received them, and have known surely that I came out from thee, and they have believed that thou didst send me.
The word "they" is a pronoun and the antecedent has been established in the text as his apostles. They received his words and his person, save one.
There is recorded in this chapter the actions of the God man. He gave the apostles something. Eleven of the 12 received what he gave. They believed what he said about the words he had given.
Received and believed are action verbs. They describe what they did as a result of what God did. The apostle who chose not to receive his words and believe the Father had sent him is contrasted with these 11 apostles. His decision caused him to oppose Jesus and work against him and the other disciples.
12 While I was with them in the world, I kept them in thy name: those that thou gavest me I have kept, and none of them is lost, but the son of perdition; that the scripture might be fulfilled.
One of the things that is confirmed in this prayer is that God is pleased by faith in his words, something that is sadly lacking by some on this forum.
Heb 11:6 But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him.
Joh 17:18 As thou hast sent me into the world, even so have I also sent them into the world.
19 And for their sakes I sanctify myself, that they also might be sanctified through the truth.
20
Neither pray I for these alone, but for them also which shall believe on me through their word;
21 That they all may be one; as thou, Father, art in me, and I in thee, that they also may be one in us: that the world may believe that thou hast sent me.
Verse 20. Believe on me through their word, which is the gospel, something that had never been preached at that time and was not believed by these apostles at the first.