'Mysteries' in the Bible

So then, let us [who minister] be regarded as servants of Christ and stewards (trustees, administrators) of the mysteries of God [that He chooses to reveal].

And if I have the gift of prophecy [and speak a new message from God to the people], and understand all mysteries, and [possess] all knowledge; and if I have all [sufficient] faith so that I can remove mountains, but do not have love [reaching out to others], I am nothing.