I love astrology to bits, but (with apologies to Linda Goodman) in no way did Shakespeare intend this to describe a Pisces. I gave a quick scan of the play, and, indeed, this is Brutus trying to stir Cassius to fight at Philippi. I'll give the quote its context:
BRUTUS. Good reasons must of force give place to better.
The people 'twixt Philippi and this ground
Do stand but in a forced affection,
For they have grudged us contribution.
The enemy, marching along by them,
By them shall make a fuller number up,
Come on refresh'd, new-added, and encouraged;
From which advantage shall we cut him off
If at Philippi we do face him there,
These people at our back.
CASSIUS. Hear me, good brother.
BRUTUS. Under your pardon. You must note beside
That we have tried the utmost of our friends,
Our legions are brim-full, our cause is ripe:
The enemy increaseth every day;
We, at the height, are ready to decline.
There is a tide in the affairs of men
Which taken at the flood leads on to fortune;
Omitted, all the voyage of their life
Is bound in shallows and in miseries.
On such a full sea are we now afloat,
And we must take the current when it serves,
Or lose our ventures.
CASSIUS. Then, with your will, go on;
We'll along ourselves and meet them at Philippi.
It's from the fourth act of
Julius Caesar. I still think the quote has relevance to Grissom (as I mentioned above), but it isn't about being Pisces (Shakespeare certainly gives it no such index). I think Goodman is assigning something to this quote that it and its context don't support. The quote is a truism, applicable to all mankind, and has no specific relevance to any character type, so to say there is something peculiarly "Pisces-like" about it doesn't make much sense to me. I think she was just skimming through Bartlett's for quotes relevant to water and threw in this one, without really reading it carefully or in context. But that's just my opinion as a Shakespeare-mad, astrology-loving CSI-oholic. As always, YMMV.
I took a gander at the promo photos for "Leapin' Lizards" in the Season 7 photo thread, and, if you don't mind being spoiled, there are some tasty ones in there. I can't wait for Thursday. Looks like he's going to be just as smoking as he was last week!
Edited to make the Shakespeare easier to read, and to agree with you,
desertwind, that all Pisces seem to like fish. My sister is a Pisces and she is obsessed with all things aquatic. I wonder if Billy has an aquarium?