From G573; {singleness} that {is} (subjectively) sincerity (without dissimulation or self {seeking}) or (objectively) generosity (copious bestowal): - {bountifulness} liberal ({-ity}) {simplicity} singleness.
Luk 11:34The light of the body is the eye: therefore when thine eye is singleG573, thy whole body also is full of light; but when thine eye is evil, thy body also is full of darkness.