i believe you ever heard that sentence. Ya what i would like to say is people forget this sentence when they fall in love.
Why? because of their love make them blind.
they see their couple as the perfect one without see their other part, weakness.
that's why when they decide to get a marriage, almost people said that the first year is the hard year of marriage. they start the adaptation between their couple's weakness in their marriage.
that's why a lot of couples get a divorce. because they aren't learned about eachother weakness.
selection stage for people decide their soulmate forever is the best stage to think objective not subjective so they will forget about "nobody is perfect" and finally get in a marriage without any consideration wheter they can accept their couple weakness or not.
there is a interesting sentence about marriage that i heard by someone who has his marriage about 10 years :" 1 year on a marriage is just all about sexuality and the year after that is just suffering."
people think they can fill their love need each other. that's totally a wrong prespective. imagine if people is a glass. their love is just like a half water in a glass, when 2 glasses try to fill each other, it will always be the other glass leave with empty water.
find your soulmate who love in God is the important qualification, because if she/he love in God,they will love you with God's love which is mean : unconditional and everlasting.
How it could be? because God is love and your soulmate learn to love as Jesus love human as much.
and it will never leave with an empty glass because God had fill it up.