“And they were all filled with the holy Spirit and began to speak in different tongues, as the Spirit enabled them to proclaim” (Acts 2:4)
By the Sacrament of Confirmation, the baptized are more perfectly bound to the Church and are enriched with a special strength of the Holy Spirit. Hence they are, as true witnesses of Christ, more strictly obliged to spread and defend the faith by word and deed. (CCC1285)
Through this sacrament Christ imprints in our souls an indelible spiritual mark, a character that is sealed by the Holy Spirit which clothes us with the power from the high to be His witnesses. (CCC1304)