And then I fancy that the daily intimacy with the sick man moved her strangely. She raised his head to give him food, and it was heavy against her hand; when she had fed him she wiped his sensual mouth and his red beard. She washed his limbs; they were covered with thick hair; and when she dried his hands, even in his weakness they were strong and sinewy. His fingers were long; they were the capable, fashioning fingers of the artist; and I know not what troubling thoughts they excited in her. He slept very quietly, without a movement, so that he might have been dead, and he was like some wild creature of the woods, resting after a long chase; and she wondered what fancies passed through his dreams. Did he dream of the nymph flying through the woods of Greece with the satyr in hot pursuit? She fled, swift of foot and desperate, but he gained on her step by step, till she felt his hot breath on her neck; and still she fled silently, and silently he pursued, and when at last he seized her was it terror that thrilled her heart or was it ecstasy?

请教老师：上面节选中，这一句 and I know not what troubling thoughts they excited in her.没看懂，  I know not sth 和 I don't know sth 一样的含义吗？麻烦老师分析一下，谢谢！