Love: n. the god, not the emotion
Notice the capital letter Gorgias uses. He's talking about Aphrodite, who we generally think of, or also Eros, Aphrodite's male counterpart.* The Greek word eros as Prof. Burton explained last class was also the word for homosexual behavior or sexual desire. But instead of employing this as a description of a human's (or a woman's) weakness, Gorgias puts Love into the higher and more powerful category of deity. Then surely Helen is innocent: nobody's going to argue with the gods, right?
In a similar but more serious manner, I have felt greatly persuaded by the power of the Spirit of God. I remember once sitting in sacrament meeting on fast Sunday and feeling filled with the Spirit. I was prompted to bear my testimony. It wasn't just that, though--without any spoken words or physical hands pushing on my back, I felt completely persuaded to get up and speak. The only way I can think to describe it is that the Spirit carried me up to the pulpit. Indeed, the persuasion of God is immensely powerful.
*More about Eros the god.