The Greek noun “εἰλικρίνεια”

Limited to 1 Cor. 5:8; 2 Cor. 1:12; 2:17, the Greek noun “eilikrineia” meant “purity of motive” or “sincerity.”  This “is ‘perfect purity’ and describes the mind, the heart, one’s conduct.  Better yet, it describes Christian existence in its relation to God and to people.  It is not so much the absence of duplicity or hypocrisy as a fundamental integrity and transparency; it can be compared to innocence, the candor of children, to whom the kingdom of heaven belongs (Mark 10:14)” (Spicq, 1:423).