Wine comes in at the mouth And love comes in at the eye; That's all we shall know for truth Before we grow old and die.

In this quote, William Butler Yeats explores the connection between wine and love, presenting them as two powerful forces that enter our lives in different ways. Wine enters "at the mouth," symbolizing its immediate and physical pleasure, while love enters "at the eye," suggesting the initial attraction and emotional connection we experience through visual and sensory impressions. Yeats seems to suggest that these are two of the most significant experiences in life, which we fully understand only in the moment, before the inevitability of aging and death take away our vitality and clarity.

The quote reflects Yeats' belief in the transient nature of life and the fleeting nature of human experience. He hints that the true pleasures of life, like enjoying a glass of wine or falling in love, are often most vivid in youth, and as we grow older, we may lose the ability to experience them with the same intensity. There’s a sense of ephemerality in the idea that we can only know these truths while we are still alive and full of vitality, before the reality of aging sets in.

Additionally, the quote touches on the notion that sensory experiences—such as the taste of wine and the visual impact of love—are integral to how we understand the world. Yeats seems to imply that our understanding of love is not just emotional but also visual, as we often fall in love at first sight or are drawn to the appearance of someone, which then leads to deeper connections. The mention of wine also suggests that some pleasures are more immediate, while love, though equally significant, is more complex and gradually nurtured.

Ultimately, Yeats uses this quote to comment on the ephemeral nature of life and love. It’s a reflection on how we experience the world and its pleasures, recognizing that some of our most profound truths—such as love and enjoyment—are fleeting and limited by time. This blend of sensory experiences and the inevitability of death creates a bittersweet meditation on the fleeting beauty of life.