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Use "singleness" in a sentence
"That thing we call singleness of heart and mind is a dread thing to behold."
"They would be obedient and respectful to their officers; friendly, kind, and at peace one with another; would perform their duties, "not with eye-service; as men pleasers, but in singleness of heart, fearing GOD.""
"I have emancipated myself from that so far I have reason to consider false; - I am able to have faith in singleness of motive, and to tread under foot all temptations to expediency."