"Ho, everyone who thirsts, come to the waters; and you that have no money, come buy and eat! Come buy wine and milk without money and without price.
Why do you spend your money for that which is not bread, and your labor for that which does not satisfy?
Listen carefully to me and eat what is good, and delight yourselves in rich food.
Incline your ear to me, and come to me; listen so that you may live. I will make with you an everlasting covenant, my steadfast, sure love for David." (Isaiah 55: 1 – 3) NRSV.
"Blessed are they who hunger and thirst for righteousness, for they will be satisfied." (Matthew 5: 6) Hunger and thirst for God's kingdom are essential prerequisite for salvation. They are also the vital conditions for receiving the fullness of the Holy Spirit.
Everyone is invited to the feast but the qualification is thirst. Where God gives grace, he first gives the thirsting after it. Where he has given a thirsting after grace, he will give it.
All people are invited to "come you to the waters." Come to Jesus Christ in the: Eucharist, Blessed Sacrament, Sacrament of Reconciliation, word of God and prayer. "Come and buy; come and eat" implies full possession. Christ Jesus outperforms our expectations in his provisions. "Come and buy wine and milk." The gifts are priceless. The giver does not need our money.
Isaiah 55: 1-3 foreshadows the incredible and invaluable gifts of the Sacraments which flow out of the sacrificial death of Jesus Christ.