Christ the Sum and Centre
“Christ Jesus the Lord, is the sum and centre of all divine revealed truth; 
neither is any thing to be preached unto men,
as an object of their faith, or necessary element of their salvation, which does not, in some way or other, either meet in him, or refer unto him. All truths, especially divine, are of a noble and precious nature; and, t herefore, whatsoever mysteries of his counsel God has been pleased in his Word to reveal, the church is bound in
her ministry to declare unto men.
And St. Paul professes his faithfulness therein, ‘I have not shunned to declare unto you all the counsel of God’ (Acts 20.27): but yet all this counsel (which elsewhere he calls the testimony of God) he gathers together into one conclusion, ‘I determined not to know any thing amongst you’ (1 Corinthians 2.1-2), that is, in my preaching unto you to make discovery of any other knowledge, as matter of consequence or faith, but only of Jesus Christ and him crucified (2 Corinthians 4.5). And therefore preaching of the Word, is called preaching of Christ,—and ministers of the Word, ministers of Christ (1 Corinthians 4.1-2; 2 Corinthians 3.6, 14),—and learning of the Word, learning of Christ (Ephesians 4.20); because our faith, our works, and our worship (which are the three essential elements of a Christian, the whole duty of man, the whole will of God,) have all their foundation, growth, end, and virtue, only in and from Christ crucified.”
—Edward Reynolds (1599-1676)
An Explication of the Hundred and Tenth Psalm