The next letter dated June 30, 1768, may be described as a very brief treatise on Sanctification. Then there is a gap of nearly a year, the next letter being dated May 20, 1769. Peggy has had to endure a great trial. Her sister Molly married a Mr. John Collinson of London. The _Newcastle Courant_ of April 29, 1769, thus announces the fact: "Thursday, was married at St. Andrew’s, Mr. John Collinson of London to Miss Dale of Northumberland Street, daughter of the late Mr. Dale of Tunstall, near Sunderland, a most agreeable young lady, endowed with every qualification to render the marriage state happy, with a fortune of £2,000." But Peggy felt her sister’s defection much. Wesley was strongly in favour of the single life both for men and women. He had published a treatise in favour of celibacy, entitled _Thoughts on a Single Life_. It is true that he himself afterwards married in the year 1751, but, as his matrimonial experiences were distinctly unfortunate (he separated from his wife for ever after five years of married life), he was not unnaturally more than ever firmly convinced of the advantage of celibacy.[25] Peggy was as yet quite sure that John Wesley was right in this as in everything else. He comforts her thus: "The hearing from my Dear Peggy at this critical time gives me a particular satisfaction. I wanted to know, How you bore such a trial, a wound in the tenderest part. You have now a first proof that the God whom you serve, is able to deliver you in every trial. You feel and yet conquer.... I hope you are delivered not only from _repining_ with regard to Her, but from _reasoning_ with regard to yourself. You still see the more excellent way, and are sensible of the advantages you enjoy. I allow _some_ single women have fewer Advantages for Eternity than they might have in a married State. But, blessed be GOD you have all the Advantages wch one can well conceive.... O may you improve every advantage to the uttermost. And give more and more comfort to, my Dear Peggy, your Affectionate Brother, J. Wesley."