Why did Jesus call his mother "Woman" and not "Mother"?

Some people often misunderstand or narrowly interpret this word to mean
disrespect or just Jesus himself did not give importance to Mary's motherhood.
Both these interpretations are incorrect.

The word "Woman" appears in crucial places in the Scriptures:In Genesis, Eve is
called "Woman" by Adam (Genesis 2:23); In Genesis 3:15, it says, "I will put enmity
between you and the woman, between her seed and your seed; in John's gospel,
Mary is called "Woman" by the "new Adam" (Jesus) at the wedding at Cana (John
2:4); At the foot of the cross, Jesus says "Woman,behold your son " (John 19:26);and
in Revelation 12:1,the "Woman" clothed with sun who will fight the dragon is
seen as Church,as well as a fulfillment of the new Eve.

By calling her "Woman" Jesus associates his Mother with his mission on earth; no
longer is she merely the one who gave him birth, but the Woman who, through her
own obedience to the Father's plan, can co-operate in the mystery of Redemption.
Thus, Jesus is identifying Mary as the Woman who will bear the Seed (Messiah) who
will destroy the power of the enemy.This word "Woman" so charged with meaning,
Mary attains a new dimension of her co-operation in salvation as the new Woman,
the second Eve.

What do the letters "I N R I" on Jesus'cross mean?

The letters "INRI" are initials for Latin title that Pontius Pilate had written over the
head of Jesus Christ on the cross (John 19:19).Latin was the official language of
the Roman Empire.The words were  "Iesvs Nazarennvs Rex Ivdaeorvm.)"Latin uses"I"
instead of the English "J" and "V" instead of "U" (i.e., Jesus Nazarenus Rex Judaeorum).
It read:Jesus the Nazarean,the King of Jews,as it was the custom to place  sign stating
the offense on the cross in Latin,Greek,and Hebrew.The Early Church adopted the first
letters of each word of  inscription "INRI" as a symbol. Throughout the centuries INRI
has appeared in many paintings of the crucifixion.

Why do we give so much importance to St.paul (a self-appointed Apostle)and his letters?

St Paul did not appoint himself as an apostle but Jesus Christ appointed him.
Originally there were twelve Apostles chosen during Christ's lifetime;but
apostleship was extended later.St Paul was the most famous addition called by
Christ,like the Twelve,to be an ambassador for Christ(2 Cor.5:20).Paul wrote
to the Galatians:"From Paul,an apostle appointed not by human beings nor through
any human being but by Jesus Christ and God the Father who raised him from the
dead" (Gal 1:1).St.Paul's letters are exemplary not only for their style but also for the
variety and importance of their doctrinal teaching.