Here the New Testament records the very first miracle performed by Jesus: at a wedding between a man and a woman. Clearly, this emphasizes that marriage is the beginning of the real Christian teaching.
1 And the third day there was a marriage in Cana of Galilee; and the mother of Jesus was there:
2 And both Jesus was called, and his disciples, to the marriage.
3 And when they wanted wine, the mother of Jesus saith unto him, They have no wine.
4 Jesus saith unto her, Woman, what have I to do with thee? mine hour is not yet come.
5 His mother saith unto the servants, Whatsoever he saith unto you, do it.
6 And there were set there six waterpots of stone, after the manner of the purifying of the Jews, containing two or three firkins apiece.
7 Jesus saith unto them, Fill the waterpots with water. And they filled them up to the brim.
8 And he saith unto them, Draw out now, and bear unto the governor of the feast. And they bare it.
9 When the ruler of the feast had tasted the water that was made wine, and knew not whence it was: (but the servants which drew the water knew;) the governor of the feast called the bridegroom,
10 And saith unto him, Every man at the beginning doth set forth good wine; and when men have well drunk, then that which is worse: but thou hast kept the good wine until now.
11 This beginning of miracles did Jesus in Cana of Galilee, and manifested forth his glory; and his disciples believed on him.
The transmutation of water into wine is symbolic; we know this because firstly no true Prophet or Divine Being would perform a miracle by happenstance: everything they do is meaningful and with purpose. Second, no awakened master would give alcohol to drunkards, or encourage harmful behavior. Thus, it is clear that this miracle represents something deeper: the ability of Christ (also known as Kuan-Yin, Avalokitesvara, Vishnu) to transform the sexual water into the sacred wine of ecstasy: spiritual illumination. This is only possible at the wedding feast - the sexual act - between man and woman.
This chapter is explained in detail in the audio lecture The Sacrament of Matrimony.