In the Regnum Christi Movement, we have always emphasized the importance of charity in words. Not that we invented the concept—on the contrary, the power of words to work good or ill is an unmistakable biblical motif. Yet in Regnum Christi we have always given special attention to this arena of Christian virtues. The goal of this essay is to present a calm, systematic reflection on what charity in words truly consists of. We will start by reviewing the different types of sin the Church has always warned us against regarding our use of words. Then we will explore the vast horizon of virtue in this field, trying to see what spiritual maturity looks like there, and how to grow in that maturity.