From the Reading from the Evening Prayer of the Liturgy of the Hours for Wednesday of the Third Week of Lent:
Work with anxious concern to achieve your salvation. It is God who, in his good will toward you, begets in you any measure of desire or achievement. In everything you do, act without grumbling or arguing; prove yourselves innocent and straightforward, children of God beyond reproach. (Philippians 2:12b-15a)
“Work with anxious concern to achieve your salvation.” No one’s salvation is guaranteed. We can never really be sure with absolute certitude. Given the stakes of eternity, that’s a big deal. “Once Saved, Always Saved” is a heresy, and given its presumption of God’s Mercy, a sure pathway to Hell.
“It is God who, in his good will toward you, begets in you any measure of desire or achievement.” God loves you and wants you with Him forever. Not many say that about you. Therefore, He instills or creates in you (begets) the desire to gain Heaven. This is through the graces He freely sends you; your cooperation with those graces determines the eventual outcome.
“In everything you do, act without grumbling or arguing; prove yourselves innocent and straightforward, children of God beyond reproach.” This is self-explanatory: the inner serenity that you should have as being a child of God should affect your behavior. It should be beyond reproach when compared to seculars.
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