On the day when she wants to receive her God, she spends part of the morning thinking of temporal matters. If it is a man, he will be thinking about his deals and his sales. If it is a married woman, she will be thinking about her household and her children. If it is a young girl, her thoughts will be on her clothes.
If it is a boy, he will be dreaming about passing pleasures and so on. The lukewarm soul shuts God up in an obscure and ugly kind of prison. Its possessor does not crucify Him, but God can find little joy or consolation in his heart. All his dispositions proclaim that his poor soul is struggling for the breath of life.
After having received Holy Communion, this person will hardly give another thought to God in all the days to follow. His manner of life tells us that he did not know the greatness of the happiness which had been his.
A lukewarm Christian thinks very little upon the state of his poor soul and almost never lets his mind run over the past. If the thought of making any effort to be better crosses his mind at all, he believes that once he has confessed his sins, he ought to be perfectly happy and at peace. He assists at Holy Mass very much as he would at any ordinary activity. He does not think at all seriously of what he is doing and finds no trouble in chatting about all sorts of things while on the way there.
This is a selection by a larger piece by St. Jean Vianney from this previous thread forums.catholic.com/showthread.php?t=518382
The whole issue about lukewarmness has been troubling me for months. Is St. Vianney saying that we cannot have any thoughts other than the Eucharist on Sundays, or am I misinterpreting this? Also, are we really not allowed to talk about any other things on the way to mass? I understand that we are to put God above all things, but reading this makes me worry that any secular related matter is an affront to God. I need help please.