Saint Jean Climaque
Fire is produced from stone and steel; lying comes from loquacity and gossip. And the lie destroys love. No one who has any sense would say that telling lies is not an important sin. The Holy Spirit has severely condemned it. "You destroy those that speak lies," says David to God. (Ps. 5, 7) The mother of lying is hypocrisy, mother and also, often, its substance as well. Hypocrisy in fact works out the lie beforehand and then puts it into practice. Those who possess the fear of God are the furthest from telling lies, because they have an honest judge, their own conscience.'
St. John Climacus