"When my spirit is faint, thou knowest my way."

     Ps 142:3a RSV.

בְּהִתְעַטֵּ֬ף עָלַ֨י רוּחִ֗י וְאַתָּה֮ יָדַ֪עְתָּ נְֽתִיבָ֫תִ֥י

My translation:  When my spirit faints away on me, you know my path.
My paraphrase (in the light of v. 3b):  When my courage [(רוּחִ֗י)] fails me, you know where the [trap-free] footfalls are.