Amen, it's the born again ones, Christ's Sheep [God's Elect Titus 1:1] He gave His Life for John 10:11, 15 which shall come to believe the Truth, the Hidden Wisdom of God 1 Cor. 2:7. Therefore, it's them exclusively that are given to believe the Truth and to Hear His Voice John 10:3 in the Gospel by the Spirit's Sanctifying Work which saves them from an experimentally lost [natural man] condition 2 Thes. 2:13.
However, to the Eternally Lost, [the reprobate goats Mat. 25:41], the Gospel shall be kept secret, hidden from them 2 Cor. 4:3 for all time, keeping them in a permanently lost state Mat. 13:11b.
Amen God reveals His Spiritual Mysteries to His Saints Col 1:25-26
[FONT="]25 Whereof I am made a minister, according to the dispensation of God which is given to me for you, to fulfil the word of God;[/FONT]
[FONT="]26 Even the mystery which hath been hid from ages and from generations, but now is made manifest to his saints[set apart ones]:[/FONT]