The Great Commandment (Latin - Mandatum Maximum)
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Thou shalt love the Lord thy God with thy whole heart, and with thy whole soul, and with thy whole mind.

This is the greatest and the first commandment.

The second is like to this: Thou shalt love thy neighbor as thyself.

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Diliges Dominum Deum tuum ex toto corde tuo, et in tota anima tua, et in tota mente tua.

Hoc est maximum et primum mandatum.

Secundum autem simile est huic: Diliges proximum tuum sicut teipsum.

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CITATION: MT. CHAP. 22 VER. 37-39, DOUAY-RHEIMS

Note: The Latin might not be correct since I don't know the language.