The practice of putting ashes on one's forehead has been known from ancient times. In the Nordic pagan religion, placing ashes above one's brow was believed to ensure the protection of the Norse god, Odin. This practice spread to Europe during the Vikings conquests. This laying on of ashes was done on Wednesday, the day named for Odin, Odin's Day. Interestingly enough, according to Wikipedia, one of Odin's names is Ygg. The same is Norse for the World Ash. This name Ygg, closely resembles the Vedic name Agni in pronunciation.... http://www.beaconoftruth.com/ash_wednesday.htm
Personally I don't "sweat it"...it is just one more pagan practice of Rome... nothing more to see.. just keep moving
The Catholic Church readily agrees it’s take into it’s service pagan practices so it should be not surprise that much of what they do and believe has it’s base in paganism.
The liturgical use of ashes originates in Old Testament times. Ashes symbolized mourning, mortality and penance. For instance, in the Book of Esther, Mordecai put on sackcloth and ashes when he heard of the decree of King Ahasuerus (or Xerxes, 485-464 B.C.) of Persia to kill all of the Jewish people in the Persian Empire (Est 4:1). Job (whose story was written between the 7th and 5th centuries B.C.) repented in sackcloth and ashes (Job 42:6). Prophesying the Babylonian captivity of Jerusalem, Daniel (c. 550 B.C.) wrote, "I turned to the Lord God, pleading in earnest prayer, with fasting, sackcloth and ashes" (Dn 9:3). In the fifth century B.C., after Jonah's preaching of conversion and repentance, the town of Ninevah proclaimed a fast and put on sackcloth, and the king covered himself with sackcloth and sat in the ashes (Jon 3:5-6). These Old Testament examples evidence both a recognized practice of using ashes and a common understanding of their symbolism.
Jesus Himself also made reference to ashes. Referring to towns that refused to repent of sin although they had witnessed the miracles and heard the good news, our Lord said, "If the miracles worked in you had taken place in Tyre and Sidon, they would have reformed in sackcloth and ashes long ago" (Mt 11:21).