Unfortunately I have to type this up again. For some reason it didn't go through. In anycase, here's a little background:
The word 'sacrament' is from the latin word '
sacramentum', which in English means 'oath'. And the word 'covenant' is also closely related to the word 'oath'
So when someone is getting married, they're declaring and oath before God. The significance of this 'oath' is that God swore himself an oath when he says things like:
"This is the covenant I will make with the house of Israel after that time," declares the LORD . "I will put my law in their minds and write it on their hearts. I will be their God, and they will be my people. (Jer 31:33)
And we see similar language in Ex 20:2 "I am the LORD your God..."
In anycase, when belivers partake in the sacraments, like baptism, they're making an outward confession towards God that they will follow him all the days of their lives. You might want to check out this link:
http://www.christianforums.com/showthread.php?postid=434154#post434154
It'll explain how baptism fits into the biblical picture.
Anyway, the Lord's supper is also a very special sacrament. When believers partake in it, they're renewing the covenant with God. Think of it like this: A married couple going out on a date to eat dinner. Quite rare to see isn't it? Yet, some married couples do that.
And that's exactly what's going on in the marriage supper of the lamb (which is the eucharist, the lord's supper) in Rev 19:9. And then there's the famous passage:
"Here I am! I stand at the door and knock. If anyone hears my voice and opens the door, I will come in and
eat with him, and he with me. " (Rev 3:20)
So the Lord's supper a very intimate thing between God and his people. it's as if God's people are 'renewing the covenant' every time they chose to participate in the Lord's supper.
And another example is holy matrimony. It was important that man be created in the image of God, that what we do on earth reflects what goes on in heaven (Matt 6:10, Heb 8:5). So when a man and a woman get married, they're literally reflecting the image of Christ and the church. St. Paul talks about that in Eph 5:22-31. Cool stuff isn't it?
So the sacraments aren't mere empty rituals but rather I think God's involved with every one of them and pouring out his blessings when believers partake in them, like marriage. Not everyone is married, yet those who do experience a particular blessing. Of course those who don't marry experience a different (and perhaps a better) blessing in light of Matt 19:10, 1 Cor 7:38. But the fact is marriage is a sacrament, while celibacy isn't
Hope this shed at least some light into understanding the sacraments
God bless!
-Jason