MANY IRREFUTABLE PROOFS
Act 1:3 To whom also He 1presented Himself alive after His suffering by many irrefutable proofs, 2appearing to them through a period of 3forty days and speaking the things concerning the 4kingdom of God. (RcV)
Commenting on the word presented, footnote 1 on verse 3, says,
"This was to train the disciples to practice and enjoy the Lord's invisible presence. See note 26(3) in John 20." (The New Testament Recovery Version, Revised edition 1991, published by Living Stream Ministry, Aneheim, California)
To make this verse more clear I'll quote few more translations:
(BBE) And to whom he gave clear and certain signs that he was living, after his death; for he was seen by them for forty days, and gave them teaching about the kingdom of God:
(CEV) For forty days after Jesus had suffered and died, he proved in many ways that he had been raised from death. He appeared to his apostles and spoke to them about God's kingdom.
(ERV) This was after his death, but he showed them that he was alive, proving it to them in many ways. The apostles saw Jesus many times during the 40 days after he was raised from death. He spoke to them about God's kingdom.
(GNB) For forty days after his death he appeared to them many times in ways that proved beyond doubt that he was alive. They saw him, and he talked with them about the Kingdom of God.
(GW) After his death Jesus showed the apostles a lot of convincing evidence that he was alive. For 40 days he appeared to them and talked with them about the kingdom of God.
In my opinion, the translation that makes very clear this verse is the GNB, so I'll quote from it just the first part, For forty days after his death he appeared to them many times in ways that proved beyond doubt that he was alive.
It is quite clear that the purpose of Christ appearing was to prove beyond doubt that He had been resurrected from the dead. To this agree 1 Cor. 15, a chapter on the resurrection of the dead.
1Co 15:3 For I delivered to you, in the first place, what also I had received, that Christ died for our sins, according to the scriptures;
1Co 15:4 and that he was buried; and that he was raised the third day, according to the scriptures;
1Co 15:5 and that he appeared to Cephas, then to the twelve.
1Co 15:6 Then he appeared to above five hundred brethren at once, of whom the most remain until now, but some also have fallen asleep.
1Co 15:7 Then he appeared to James; then to all the apostles;
1Co 15:8 and last of all, as to an abortion, he appeared to *me* also. (Darby)
In this chapter Paul was proving that Christ had been raised from the dead, according to the scriptures and the proof was the many witnesses that saw Him.
To me, it seems a little too much to say that the disciples needed a training “to practice and enjoy the Lord's invisible presence”. For centuries, the Jews had been trained to live and communicate with an invisible God who gave an explicit commandment not to set up a visible image. The disciples only needed irrefutable proofs of Christ resurrection. That issue settled they were ready to be witnesses of His resurrection.
1 Pe 1:8 whom, having not seen, ye love; on whom though not now looking, but believing, ye exult with joy unspeakable and filled with the glory (Darby)