1.The reason he has to say none the less is because in the first part of the sentence he is showing that he knows this to be a bad idea. That reason and promise and peace, etc. all say that he should not love her. but he loves her anyway/none the less 2. "it had no more influence in restraining me than if I had devoutly believed her to be human perfection." The fact that he knew (whatever he knew) had no influence on his love. Think of it like this: The person you love is absolutely perfect. You are madly in love and believe this person might actually be an angel, they are so perfect (think of love when you were a teenager). Then your friend tells you that they saw your lover going out with someone else. Do you believe it? No. Because you think this person is perfect. In the same way, Whatever the narrator of the story discovered had no effect on him.