Jesus saw Nathanael coming toward him and said of him,
“Here is a true child of Israel.
There is no duplicity in him.”
-- John 1:45-51
Truth or truthfulness is the virtue which consists in showing oneself true in deeds and truthful in words, and guarding against duplicity, dissimulation, and hypocrisy.
-- CCC 2505
Art: St. Nathanael / Bartholomew, detail, Last Judgment by Michelangelo.