pass the Rubicon

Cupidity has drawn a line of demarcation; it has established boundaries for thought; and miserable has been the fate of the unhappy wretch who, rejoicing in the dignity of his nature, and anxious to discover the abode of Truth, has dared to pass the Rubicon.

"My beloved one, you reason beautifully, but will you tell me where you have managed, in a convent, to pass the Rubicon?"

In an hour at most he must pass the Rubicon.

Rubicon, rōōb′i-kon, n. a stream of Central Italy, forming the boundary in the republican period of ancient Roman history between the province of Gallia Cisalpina and Italia proper.—Pass the Rubicon, to take a decisive, irrevocable step, as Julius C�sar's crossing this stream, the limit of his province—a virtual declaration of war against the republic.

Did C�sar hesitate to pass the Rubicon?