“Love is a vessel that contains both security and adventure, and commitment offers one of the great luxuries of life: time. Marriage is not the end of romance, it is the beginning.”
Source: Mating in Captivity: Reconciling the Erotic and the Domestic
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Esther Perel 4
Belgian Psychotherapist and Author 1958Related quotes

“There is no greater romance in life than this adventure in realization.”
Message at Pickfair, Beverly Hills, California (1 June 1932), as quoted in Life Is A Jest (1974) edited by A. K. Hajra <!-- or 6 January? 1932 Me p100-101 -->
General sources
Context: Life becomes meaningful and all activities are purposeful only on the basis of faith in the enduring reality. … The greatest romance possible in life is to discover this Eternal Reality in the midst of infinite change. Once, one has experienced this, one sees oneself in everything that lives, one recognises all of life as his life, everybody's interests as his own. One is no longer bound by habits of the past, no longer swayed by the hopes of the future — One lives in and enjoys each present moment to the full. There is no greater romance in life than this adventure in realization.

“Love is a wonderful game which begins in fun and ends in marriage.”
Source: The 10th Victim (1965), Chapter 15 (p. 131)

“To love oneself is the beginning of a lifelong romance.”
Lord Goring, Act III
Source: An Ideal Husband (1895)

On his play Yachiyo in “Family Secret Revealed on Stage / Philip Kan Gotanda tells tragic story of aunt he never knew in `Yachiyo'” https://www.sfgate.com/entertainment/article/Family-Secret-Revealed-on-Stage-Philip-Kan-3020373.php in SF Gate (1995 Nov 5)
“This was the Great Romance. To love at any cost.”
Source: Black: The Birth of Evil