In Diana Gabaldon's "Written in My Own Heart's Blood," the author explores the unpredictable nature of marriage. She emphasizes that despite the advice and expectations one may receive, the true experience of being married remains a mystery until one is fully immersed in it. This insight speaks to the complexities and adventures that come with a committed relationship.

The notion that no one can fully understand marriage beforehand highlights the importance of personal experience in forming our perceptions of love and partnership. It suggests that each couple's journey is unique, shaped by their individual challenges and joys as they navigate life together.