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Lovingly share with the Mormon you know there is no reason to sustain the self-appointed men in the LDS Church.
Spend time showing from His word there is only One that stands between men and God, and only One we should ever sustain; that being Christ Jesus.
Likewise, the priesthood is only held by One person, and again this is Jesus.
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“Sustaining the Prophets” “The living Lord leads His living Church! The Lord reveals His will for the Church to His prophet. … Think of that! We sustain 15 men as prophets of God! They hold all the priesthood keys that have ever been conferred upon man in this dispensation.” — Russell M. Nelson