You can’t address Ruth as full of grace because she isn’t.
No Catholic asks Mary to “have mercy on us”. None. That prayer can be addressed to God alone. We ask Mary to pray for us. Only God can be petitioned for mercy.
The saints here prayers because God permits it. It’s nothing to do with their own abilities or powers. If you think that’s impossible, you will have to explain away well documented cases, including St.Pio of Pietralcina andSt Martin de Porres, who heard prayers from afar and read hearts while still in this world. Do some research before you dismiss the mysterious and wonderful ways in which God is glorified.
” Only God can be petitioned for mercy.”
Petitioned THROUGH Mary, right?
“Mary is the intermediary through whom is distributed unto us this immense treasure of mercies gathered by God, for mercy and truth were created by Jesus Christ. Thus as no man goeth to the Father but by the Son, so no man goeth to Christ but by His Mother.” (Vatican Website: Encyclical of Pope Leo 13th on the Rosary, Octobri Mense, Pope Leo 13th, 1903-1914)
“The foundation of all our confidence is found in the Blessed Virgin Mary. God has committed to her the treasury of all good things, in order that everyone may know that through her are obtained every hope, every grace, and all salvation. For this is His will: that we obtain everything through Mary.” (Ven. Pope Pius IX)
All the Saints have a great devotion to Our Lady: no grace comes from Heaven without passing through her hands. We cannot go into a house without speaking to the doorkeeper. Well, the Holy Virgin is the doorkeeper of Heaven.
St. John Mary Vianney
All gifts, virtues, and graces of the Holy Ghost are administered by the hands of Mary to whomsoever she desires, when she desires, and in the manner she desires, and to whatever degree she desires.
St. Bernardine of Siena
She opens the abyss of God’s mercy to whomsoever she wills, when she wills, and as she wills, so that there is no sinner however great who is lost if Mary protects him . . . All men: past, present, and to come, should look upon Mary as the means and negotiator of the salvation of all ages.
St. Bernard
No thanks, I’ll stick with Jesus Christ.
“The saints here prayers because God permits it. It’s nothing to do with their own abilities or powers. “
If God “allows” it, He is giving them the power to hear and comprehend (in every language) the prayer of every Catholic on Earth, thus giving them, by definition, omnipresence and omniscience.