You are fortunate indeed to have not only understanding each

刚才我说了，根据我的语感，of 应该去掉。对吗？ fortunate indeed to not only have understanding each other, but of what it takes to ...如果按你的思路，就应该成为：not only have the understanding of each other, but the understanding of what it takes to ...或者not only have the understanding of each other, but also the possibility of what it takes to create an ideal marriage

YES, YOU ARE RIGHT 你的语感很强。毕业了吗？