Saint Teresa, as the Roman Rota attests, never fell into any mortal sin; but still Our Lord showed her the place prepared for her in Hell; not because she deserved Hell, but because, had she not risen from the state of lukewarmness in which she lived, she would in the end have lost the grace of God and been damned.
Alphonsus LiguoriWe must practice modesty, not only in our looks, but also in our whole deportment, and particularly in our dress, our walk, our conversation, and all similar actions.
Alphonsus LiguoriWhoever prays is certainly saved. He who does not is certainly damned. All the blessed have been saved by prayer. All the damned have been lost through not praying. If they had prayed they would not have been lost. And this is, and will be their greatest torment in hell: to think how easily they might have been saved, just by asking God for His grace, but that now it is too late - their time of prayer is gone.
Alphonsus Liguori