19th century churchman Horace Bushnell says something profound of individuals that is just as true of married couples: "No man is ever called to be another. God has as many plans for men as he has men; and, therefore, he never requires them to measure their life exactly by way of any other life."
Let me put this in the language of marriage:
"No married couple is ever called to be another. God has as many plans for married couples as he has couples; and, therefore, He never requires them to measure their life by any other couple."
You comprise one-half of a unique couple. No other couple has your gifts, your weaknesses, your history, your dynamics, your children, your calling. There is great freedom in accepting our couple identity as it is: "We might be strong in this area, weak in that, vulnerable here, impenetrable there, excelling in this, often failing in that, but we are a unique couple, called forth by God to fulfill our unique purpose in this world."
Don't look to other couples to measure your worth; look to God to fulfill your call. Don't compare yourself with other couples to measure your happiness; compare your obedience with God's design on your life to measure your faithfulness.
[Read the rest of the article at Start Marriage Right.]