Question: How could the mystery of Christ be hidden in previous ages and yet known by the OT Prophets?

Question: How could the mystery of Christ be hidden in previous ages and yet known by the OT Prophets?
Question: Does Paul inaccurately quote Psalm 68:18?
Question: Did Jesus descend into hell?
Question: Is anger a sin or not?
Question: Doesn't this command perpetuate the institution of slavery?
Question: If Christ emptied Himself of deity while on earth, then how could He be God?
Question: If Paul had the gift of healing, why couldn't he heal his coworker, Epaphroditus?
Question: Are Christians perfect, or still on the way?
Question: How can we rejoice always when Jesus said "blessed are those who mourn?"
Question: Is the Lord's coming at hand or far off?
Question: What happened to the lost epistle of the Laodiceans?
Question: If Christ is only the firstborn in creation, then how can He be God?