1 Corinthians 13
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You cannot say you are perfect. Check if you have done it in love. It is astonishing to be reminded that: worthless is the ability to speak in tongues, to be the most inspiring preacher, being an Einstein, even living as a saint with so much faith and sacrifice . . . everything boils down to "nada", zero, if you deduct love in the equation.
All is made perfect in love.
The next thing to ask is "what then is love"? How does one love? You can't give what you don't have? How then do you acquire love?