“Thou” was the informal second-person singular pronoun in Early Modern English, contrasted with the formal “you.” It appears extensively in Shakespeare, the Bible, and lyric poetry to express closeness, passion, or spiritual address. In verse, “thou” creates immediacy and emotional depth, whether in love sonnets, curses, or prayers. Its decline in everyday speech has made it a hallmark of poetic and liturgical language, evoking authenticity, intensity, and historical resonance in literary contexts.

Thou is the subject form of second-person singular "you," used when addressing one person familiarly. Students must understand that thou is not "old English for you"—it's specifically singular and familiar/intimate, whereas "you" was originally plural or formal singular. The distinction parallels French tu/vous or Spanish tú/usted. In Shakespeare, choosing thou versus you reveals character relationships—thou for intimacy, anger, or condescension; you for respect or formality. Parents use thou with children; children use you with parents (showing asymmetrical respect). In soliloquies and prayers, thou appears for intimate address. The conjugations differ: I do, thou dost, you do. By 1700, thou was fading except in religious language and poetry. Understanding thou/you distinctions unlocks social dynamics in Early Modern texts. Modern misuse (thinking thou is simply "old you") misses crucial relationship encoding.