I know you've heard it. Marriage is a 50/50 partnership. And I do understand why it is a common belief. It's like a business relationship where two parties invest their 50% and split the profits.  You give your part, I give my part, and together we've got 100%.  On the surface, it sounds like it works, right?

But 50% investment in marriage doesn't work because it is not giving the whole of yourself. It's only giving a part. 

In successful business partnerships, each partner has to be 100% invested in the business's success, right? Even though sports team members have different roles or positions to play, they have to play their part with 100% of themselves for the best of the team. Another example is parenting. You parent as partners, but of course, you would say each of you gives 100% to the task of raising your children. 

When I'm talking about these percentages in marriage, I'm talking about the amount of effort you give to the relationship.