Let us go on to maturity.
But grow in the grace and knowledge of our Lord and Savior Jesus Christ.
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First, the color red in the centrally located "C" in UCM symbolizes the "precious blood" (1 Peter 1:19) of the Lord Jesus Christ:
And without the shedding of blood there is no forgiveness [of sins].
But now in Christ Jesus you [Gentiles/non-Jews] who formerly were far off have been brought near by the blood of Christ.
But if we walk in the light as He Himself is in the light, we have fellowship with one another, and the blood of Jesus His Son cleanses us from all sin.
1 John 1:7
Second, the logo's catch phrase "None but Christ ~ All for Christ" is a quote from James Brainerd Taylor. Frederick William Hotchkiss (1762–1844), the Yale College-trained, 61-year Congregational pastor (1783–1844) of First Church of Christ in Saybrook, Connecticut, stated of his late friend and son-in-the-ministry James Brainerd Taylor,
To spend and to be spent in the service of Christ and for the salvation of souls was his all in all [2 Corinthians 12:15]. Often would he say, "None but Christ; all for Christ."
(Letter dated May 8, 1829. In John Holt Rice, Memoir of James Brainerd Taylor, Second Ed. [NY: American Tract Society, 1833], 423.)