An extreme rigor is sure to arm everything against it. [ Burke ]

A clear fire, a clean hearth, and the rigor of the game. [ Lamb ]

Affections injured by tyranny, or rigor of compulsion, like tempest threatened trees, unfirmly rooted, never spring to timely growth. [ John Ford ]

Both in individuals and in masses violent excitement is always followed by remission, and often by reaction. We are all inclined to depreciate whatever we have overpraised, and, on the other hand, to show undue indulgence where we have shown undue rigor. [ Macaulay ]