After this last adventure they lived at the castle undisturbed and in peaceful enjoyment. The knight was more and more impressed with the heavenly goodness of his wife, which she had so nobly shown by her instant pursuit and by the rescue she had effected in the Black Valley, where the power of Kuhleborn again commenced. Undine herself enjoyed that peace and security which never fails the soul as long as it knows distinctly that it is on the right path; and besides, in the newly-awakened love and regard of her husb…