In Spanish: “fidelidad” and “felicidad.” Cf. Saint Josemaría, Furrow, 84: “Your steadfastness in faith, purity and the way God has marked out for you is the measure of your happiness on earth.” Cf. also, for example, Instruction, May1935/14 September 1950, 60; Instruction 8 December 1941, 61; Saint Josemaría, Friends of God, 189.