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.
~ Shakespeare's Julius Caesar, IV:3
Or, as Michael Ledeen puts it in his excellent article in National Review Online:
"It (Israeli-Hezbollah conflict) is a wondrous window of opportunity. As so often in our history, it was opened by our enemies. Let’s go for it."