Constancy is a saint without a worshiper. Jean de Boufflers
Constancy in love is of two sorts: One is the effect of new excellencies that are always presenting themselves afresh, and attract our affections continually; the other is only from a point of honour, and a taking of pride not to change. Francois duc de La Rochefoucauld
The constancy of the wise is nothing else but the knack of concealing their passion and trouble. Francois duc de La Rochefoucauld