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I merely thought I would remind you that you have passed the rubicon--your thirtieth year I It is terrible to think of.— Confessions of a Young Man
We had lingered day by day, until it would have been folly to have waited longer; the rubicon was, however, now passed, and we had nothing to rely upon but our own exertions and perseverance, humbly trusting that the great and merciful God who had hitherto guarded and guidedus in safety would not desert us now Upon leaving the camp we left behind one carbine, a spade, some horse hobbles, and a few small articles, to diminish as much as possible the weight we had to carry.— Journals of Expeditions of Discovery into Central Australia and Overland from Adelaide to King George's Sound in the Years 1840-1: Sent By the Colonists of South Australia, with the Sanction and Support of the Government: Including an Account of the Manners and Customs of the Aborigines and the State of Their Relations with Europeans — Volume 01
We had lingered day by day, until it would have been folly to have waited longer; the rubicon was, however, now passed, and we had nothing to rely upon but our own exertions and perseverance, humbly trusting that the great and merciful God who had hitherto guarded and guidedus in safety would not desert us now.— Journals of Expeditions of Discovery into Central Australia and Overland from Adelaide to King George's Sound in the Years 1840-1: Sent By the Colonists of South Australia, with the Sanction and Support of the Government: Including an Account of the Manners and Customs of the Aborigines and the State of Their Relations with Europeans — Complete
Rubicon has been looked up 109 times, favorited twice, listed 20 times, and commented on once.

Century Dictionary (1)
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