Big word, we know, but actually "dispensation" in it's various forms is found 7 times in the Bible; it just means stewardship or house rule. The Bible is divided into at least 7 dispensations and as of this writing, we happen to be in the dispensation or house rule of grace. Today, God is reigning in grace, not wrath.
Today, believers are being powerfully established and equipped "to the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began, but now is made manifest" through the scriptures given to "the least of the apostles": Paul. (Rom 16:25-26)
We seek to be ambassadors for Christ, in the fellowship defense and confirmation of the gospel: "that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them..." 2 Corinthians 5:19
Unfortunately, many do not know the secret of the gospel, that: "there is one God, and one mediator between God and men, the man Christ Jesus; Who gave himself a ransom for all, to be testified in due time." 1 Timothy 2:5-6
When it became clear to the world that Israel as a nation would reject her King, God revealed what was His secret but "eternal purpose" all along: to put "no difference" between Jew and Gentile, thus forming a body of believers with a different inheritance than that which is promised to Israel.
And who better to make the "masterbuilder" (1Cor 3:10) of this message of pure grace than the leader of Israel's rebellion? Paul, the "chief of sinners"! The authority Moses had in his day is like unto the authority given Paul in ours. Please check us out.