My family is non-Catholic, and my Protestant wife has no desire of anything spiritual, even though she claims to be a Christian. I have prayed for her, had others pray for her but she seems hard. A Catholic friend of mine suggested putting some holy water in her wash when i do her wash. I am not sure what that will do, and I thought it a rather odd suggestion. Is there any purpose for it?
*The Power of Holy Water:
From the Autobiography of Saint Teresa of Avila, Chapter 31, 1562 A.D…
“From long experience I have learned that there is nothing like holy water
to put devils to flight and prevent them from coming back again. They also
flee from the Cross, but return; so holy water must have great virtue. For
my own part, whenever I take it, my soul feels a particular and most
notable consolation. In fact, it is quite usual for me to be conscious of a
refreshment which I cannot possibly describe, resembling an inward joy
which comforts my whole soul. This is not fancy, or something which has
happened to me only once. It has happened again and again and I have
observed it most attentively. It is let us say, as if someone very hot and
thirsty were to drink from a jug of cold water: he would feel the
refreshment throughout his body. I often reflect on the great importance of
everything ordained by the Church and it makes me very happy to find that
those words of the Church are so powerful that they impart their power to
the water and make it so very different from water which has not been
blessed.
One night, too, about this time, I thought the devils were stifling me; and
when the nuns had sprinkled a great deal of holy water about I saw a huge
crowd of them running away as quickly as though they were about to fling
themselves down a steep place.
I will only describe something that happened to me one night of All Souls.
I was in an oratory: I had said one nocturn and was repeating some very
devotional prayers which follow it – they are extremely devotional: we
have them in our office-book – when actually the devil himself alighted
on the book, to prevent me from finishing the prayer. I made the sign of
the Cross and he went away. I then began again and he came back. I think
I began that prayer three times and not until I had sprinkled some holy
water on him could I finish it. At the same moment I saw several souls
coming out of purgatory: their time there must have been nearly up and I
thought that perhaps the devil was trying to impede their deliverance.”*
Around my house holy water goes everywhere. I have even put it in the laundry.
It is the blessing of God on the water that makes it powerful, not the water itself’.
It is not superstition. Just be sure to pray and believe God is moving in your wife’s life.
Just your desire to see her come to the truth shows God moving through you to her.
Also, pray the rosary and try placing a green scapula under her mattress and
pray the prayer that goes with it. “Immaculate Heart of Mary, pray for us now and at the hour of our death.”
Again not superstition,
It is an act of faith, one that shows faith in the power of God and that you are “praying always” as St. Paul instructs us to do in 1 Thessalonian 5:17, “pray without ceasing.”
But we must be careful to avoid superstition 
Ex. “To attribute the efficacy of prayers or of sacramental signs to their mere external performance, apart from the interior dispositions that they demand, is to fall into superstition.”
