Catechism number 1243

The white garment symbolizes that the person baptized has "put on Christ,"⁴² has risen with Christ. the candle, lit from the Easter candle, signifies that Christ has enlightened the neophyte. In him the baptized are "the light of the world."⁴³
The newly baptized is now, in the only Son, a child of God entitled to say the prayer of the children of God: "Our Father."