Sister Lucia describes this great Vision of the Holy Trinity:

Being alone one night, I knelt near the rails in the middle of the chapel and, prostrate, I prayed the prayers of the Angel.  Feeling tried, I then stood up and continued to say the prayers with my arms in the form of a cross.
The only light was that of the sanctuary lamp. 
Suddenly the whole chapel was illumined by supernatural light, and above the alter appeared a cross of light, reaching to the ceiling.  In a brighter light at the upper part of the cross, could be seen the face of a Man and his body as far as the waist; upon his breast was dove of light; nailed to the cross was the body of another man.  A little below the waist, I could see a chalice and a large host suspended in the air, on to which drops of blood were falling from the face of Jesus Crucified and from the wound in His side.  These drops ran down on to the host and fell into the chalice.  Beneath the right arm of the cross was Our Lady and in her hand was her Immaculate heart.  (It was Our Lady of Fatima, with her Immaculate Heart in her left hand, without sword or roses, but with a crown of thorns and flames).  Under the left arm of the cross, large letters, as if of crystal clear water which ran down upon the alter, formed these words:
«Grace and Mercy.»

I understood that it was the Mystery of the Most Holy Trinity which was shown to me, and I received lights about this mystery which I am not permitted to reveal.

Our Lady then said to me:
«The moment has come in which God asks the Holy Father, in union with all the Bishops of the world, to make the consecration of Russia to my Immaculate Heart, promising to save it by this means.  There are so many souls whom the Justice of God condemns for sins committed against me, that I have come to ask reparation: sacrifice yourself for this intention and pray.»

I gave an account of this to the confessor, who ordered me to write down what Our Lady wanted done. 

Later, in an inimate communication.   Our Lord complained to me saying:
«They did not wish to heed my request.  Like the King of France, they will repent and do it, but it will be late.  Russia will have already spread her errors throughout the world, provoking wars, and persecutions of the Church;
the Holy Father will have much to suffer.»