From The Talmud:

Raba said: It is the duty of a man to mellow himself [with wine] on Purim until he cannot tell the difference between "cursed be Haman" and "blessed be Mordecai."(1)

Comments:

When using gematria (a numerical value given to each letter) the two phases have the same numerical value, 502.

Miscellaneous:

Read about The Holiday Of Purim
Read about the Messiah
Read another selection from the Talmud

Acknowledgments:

1). The Soncino Talmud Mas. Megilah 7b.