St. John Vianney
“When the thought occurs to you to go to Mass on a working day, that is a movement of grace that God is very desirous of giving you. Follow it. The saints only became holy by their great attention to and following of all the good inspirations that the good God sent them, and the damned are in hell because they despised them. You will be judged on these thoughts that you have not welcomed and on the Masses that you could have heard and that you will not hear. Ah, great God, what will become of us! The flames of purgatory will be the chastisement of our laziness or of our too selfish views.”
Source: St. John Vianney, The Meditations of the Curé D’Ars