Acharya Prashant discusses the true essence of Valentine's Day by contrasting modern consumerist celebrations with the historical and spiritual significance of Saint Valentine. He explains that Saint Valentine was a martyr who opposed violence and war, choosing instead to facilitate genuine love and spiritual awakening. The speaker highlights that the saint's act of restoring the eyesight of a jailer's daughter was a metaphor for providing spiritual vision and bringing her to the path of truth. He argues that the only gift worth giving or receiving is 'light' or wisdom, rather than material items like chocolates, jewelry, or teddy bears, which often stem from personal gratification and desire.