In plain words
Someone may say ‘I am the Self’, and yet take Shiva, whom he contemplates in order to reach him as the supreme Self, to be someone other than himself. Whoever worships in that confusion does not reach Shivahood by that path. Know this.
Word for word
Understand that one who, though thinking ‘I am the self’, takes Shiva contemplated as the supreme Self to be other, and worships in that deluded way, does not attain Shivahood by that means.