求叶芝的 《盘旋的楼梯》的原文及译文

The Winding Stair

　　My Soul. I summon to the winding ancient stair;
　　Set all your mind upon the steep ascent,
　　Upon the broken, crumbling battlement,
　　Upon the breathless starlit air,
　　'Upon the star that marks the hidden pole;
　　Fix every wandering thought upon
　　That quarter where all thought is done:
　　Who can distinguish darkness from the soul

　　My Self. The consecretes blade upon my knees
　　Is Sato's ancient blade, still as it was,
　　Still razor-keen, still like a looking-glass
　　Unspotted by the centuries;
　　That flowering, silken, old embroidery, torn
　　From some court-lady's dress and round
　　The wodden scabbard bound and wound
　　Can, tattered, still protect, faded adorn

　　My Soul. Why should the imagination of a man
　　Long past his prime remember things that are
　　Emblematical of love and war?
　　Think of ancestral night that can,
　　If bu