Yeats isn't merely asking for gentleness—he's performing a radical act of vulnerability, declaring that his interior life is so fragile it cannot survive careless words or indifference from others. Most of us pretend our ambitions and private longings are resilient things, safe from judgment, but he admits the opposite: that what we hope for exists only in the thin membrane between imagination and reality, vulnerable to the smallest disturbance. When a colleague dismisses your half-formed project idea in a meeting, or a friend laughs at something you've confessed, you understand what Yeats means—the damage isn't to your confidence alone, but to the dream itself, which somehow needs to be taken seriously in order to survive.