One and unity

Sheikh Abu Nasr Muhammad bin Muhammad al -Farabi, may God have mercy on him, said, one is said to many parts, including the one who is said to be many forms, some of which are said from the sentence of judgment, and some of them are said on the agreement of abundance in gender, type, or in an offer. Two they are one, then this and that one has no difference between them, and we say that in each two, their near gender is one, as we say in the donkey and the horse.