I find this interesting, as I reject ‘Once saved always saved’ yet I would say I experience what you have said here and not because of ‘Once saved always saved’ but rather from the unfathomable Divine Mercy of God, (St Faustina

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Diary of St Faustina -
"Mankind will not have peace until it turns with trust to My mercy. Oh, how much I am hurt by a soul’s distrust! Such a soul professes that I am Holy and Just, but does not believe that I am Mercy and does not trust in My Goodness. Even the devils glorify My Justice but do not believe in My Goodness" (Diary, 300).
"My mercy is greater than your sins and those of the entire world. Who can measure the extent of my goodness? For you I descended from heaven to earth; for you I allowed myself to be nailed to the cross; for you I let my Sacred Heart be pierced with a lance, thus opening wide the source of mercy for you. Come, then, with trust to draw graces from this fountain. I never reject a contrite heart. Your misery has disappeared in the depths of My mercy" (Diary, 1485).
"Oh, if sinners knew My mercy, they would not perish in such great numbers. Tell sinful souls not to be afraid to approach Me; speak to them of My great mercy" (Diary, 1396).
When it comes to why I reject ‘Once saved always saved’ I believe this passage Matthew 18:21-35 is very good -
In the same way, once saved always saved I believe is like saying, once the debt is forgiven it’s always forgiven, however in this passage, we see how by the officals refusal to show that same mercy, his debt was reinstated. I believe it works the same way when Catholics say we are saved by Faith and Works.
Also, if your interested AbideWithMe, Scott Hahn’s conversion story is really good, it’s Scott Hahn’s conversion story that converted my Father to Catholicism, as Scott Hahn used to be an evangelical protestant, his conversion story here -
youtube.com/watch?v=FrQN8LHYg5g
It’s the absolute truth to the real presense of the Holy Eucharist that converts so many to catholicism I believe, If you ever get a chance AbideWithMe, I would like to encourage you to vists a local Catholic Church and just sit before the tabernacle and allow His real presense in the Holy Eucharist to warm your heart. Jesus waits for us night and day at the tabernacle, He will not reproach us for our crimes, He will not throw our sins in our face, what He will do is to wash us with the blood of his wounds.
God Bless
Hope I have helped
Thank you for reading
Josh