What rhymes with singleness of heart?
sin·gle·ness of heart

Singleness of heart (also called singleheartedness) is the ideal of having sole devotion to a task or endeavour. It is normally employed in a religious or spiritual context. In antiquity it was thought of as a counteraction to the divisive effects of civilization on the soul. It is especially associated with the practices of Christian monasticism. Jesus, as recorded by Matthew 6:22 said: 22 The light of the body is the eye: if therefore thine eye be single, thy whole body shall be full of light. Referring to the desert landscape inhabited by the earliest Christian monks, Peter Brown, in A History of Private Life, explains:

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