Let's see, let's see, let's see... My Latin vocabulary has always been good and I have a copy of The New College Latin & English Dictionary, BUT I suck at grammar and I can't find my grammar book right now.

So I'm not sure if it's the youths or the branches, flowers and grass that are singing... and in the end, I'm not sure if he saying that if he goes blind/deaf whether he will STILL see and hear this beauty or if he's mourning the fact that if he goes blind/deaf, he'll never see/hear this beauty again.

Anyway, you kinda get the idea...

Zephyrus gently expels heat
and the sun proceeds with warmth
and breathes on the earth's cup
he flies in sweet stitchery

you youth dance with grace
you perceive and consider
the branches, flowers and grass
you sing in the languid breeze

Because I see while I have eyes
And we hear while we have ears
oh, for such great delight
such great breath to blow.

Spring leaves in purple splendor,
wraps us in ornate stitchery,
the earth is made of strong smelling blooms,
trees are made of branches and leaves.

I take pleasure in holding fast
and looking into the dimness,
if by fate I am left blind
I will neither see nor hear all this.