To obtain salvation we must tremble at the thought of being lost, and tremble not so much at the thought of hell, as of sin, which alone can send us thither. He who dreads sin avoids dangerous occasions, frequently recommends himself to God, and has recourse to the means of keeping himself in the state of grace. He who acts thus will be saved; but for him who lives not in this manner it is morally impossible to be saved.
The Saint Alphonsus de Liguori Collection [30 Books]: (ed. Catholic Way Publishing, 2016) - ISBN: 9781783794911