"One should not enter into marriage without knowing how to love. To love means to desire your own and your beloved's perfection, to overcome your own selfishness. Love must be total, full, complete, regulated by the law of God, and must last for all eternity in heaven."
St. Gianna Beretta Molla
When St. Gianna is referring to "perfection" I don't think she is saying that we can be completely without flaws. We are human, so we are sinners and flawed. But we are called to help each other reach our final salvation through that self-giving love and marriage. To have eternity in heaven loving God and praying for all those still on earth working toward their salvation.
St Gianna, pray for us.