The phrase 'love is blind' has one of the longest pedigrees of any romantic idiom in English, yet its connection to the biblical tradition of love is older and deeper than its most famous literary outing in Shakespeare. The idea that love renders its subject incapable of perceiving faults in the beloved runs through Proverbs, the Song of Songs, and the New Testament, before becoming a literary commonplace in Chaucer and then a household expression through Shakespeare.
In the Bible, love's power to overwhelm rational perception appears most vividly in the Song of Songs, where the beloved is described in hyperbolic terms that deliberately transcend sober assessment. The lover sees only perfection. Proverbs 10:12 states that 'love covereth all sins' - a phrase expressing not willful ignorance but the capacity of genuine affection to look past transgression and remain committed. The New Testament deepens this: Paul's great hymn to love in 1 Corinthians 13 declares that love 'beareth all things, believeth all things, hopeth all things, endureth all things.' This is love as a faculty that sees differently - not because it is impaired, but because it perceives the beloved through a different and more generous lens.
Chaucer picked up the motif directly in The Merchant's Tale (c. 1395), writing 'For loue is blynd alday and may nat see.' By this point the idea had moved from biblical theology into secular romance literature, where the blindness of love became a poetic device rather than a spiritual observation. Shakespeare cemented it across multiple plays: in The Two Gentlemen of Verona, in A Midsummer Night's Dream, and most memorably when Jessica in The Merchant of Venice says 'But love is blind, and lovers cannot see / The pretty follies that themselves commit.' Shakespeare's version is deliberately comic - love's blindness here is a source of folly rather than virtue.
The phrase bifurcated in English: in religious and moral contexts, love's blindness retained its positive sense of generous forbearance, the kind of love that covers faults and persists through imperfection. In secular and satirical contexts, the phrase meant the irrational delusion of infatuation, the inability to see a partner's real flaws. Both senses are now in play whenever the phrase is used, creating productive ambiguity.
In modern usage 'love is blind' appears in everything from dating show titles to legal proceedings, from pop songs to philosophical treatises. Netflix's reality series of that name deliberately exploits both meanings. In psychology the phrase relates to research on positive illusion - the documented tendency of people in romantic relationships to rate their partners more favorably than objective observers do. Jonathan Haidt and others have noted that this bias is not purely self-deceptive: it may function as a commitment device, keeping partners invested in relationships through periods of difficulty.
The biblical genealogy of the phrase traces a line from the Song of Songs' ecstatic praise poetry, through Paul's theological account of love as the greatest virtue, through medieval romance, through Shakespeare's comedies, and into modern popular culture. The tension between love as a divine faculty that sees more truly and love as a human blindness that sees less clearly has never been resolved - and that irresolution is precisely why the phrase retains its power. Whether 'love is blind' is a warning or a beatitude depends entirely on who is speaking and whom they are watching.