Per your comments regarding Plato and spiritual discernment. These are David and Joshua, so I’m not comparing them to Plato, but throwing this out for consideration. Pre-Pentacost Holy Spirit Examples:
1 Samuel 16:13 (New International Version)
13 So Samuel took the horn of oil and anointed him in the presence of his brothers, and from that day on the Spirit of the LORD came upon David in power. Samuel then went to Ramah.
Numbers 27:18 (New International Version)
18 So the LORD said to Moses, “Take Joshua son of Nun, a man in whom is the spirit, [a] and lay your hand on him.
Footnotes:
Numbers 27:18 Or Spirit
Heres another:
Praise God that since the Resurrection of our Lord Jesus Christ, starting at Pentecost, we Christians are actually indwelled by Him:
And as I began to speak, the Holy Ghost fell on them, as on us at the beginning. Then remembered I the word of the Lord, how that he said, John indeed baptized with water; but ye shall be baptized with the Holy Ghost. Forasmuch then as God gave them the like gift as [he did] unto us, who believed on the Lord Jesus Christ; what was I, that I could withstand God? Acts 11:15-17
And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever; [Even] the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you. John 14:16-17
But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his. Romans 8:9