During the whole of his career he felt the embarrassment of being called upon by the Catholics to produce proof of his higher mission. At times he sought to escape the difficulty, so far as miracles went, by arguing on, and straining for all they were worth, certain natural occurrences; on other occasions, however, he took refuge in jests. On one occasion he even whimsically promised to perform a manifest miracle. This was at a time when he was hard put to provide lodgings for the nuns who had fled to Wittenberg and when it was rumoured that he had undertaken a journey simply to escape the trouble. “‘I shall arm myself with prayer,’ he said, ‘and, if it is needful, I shall assuredly work a miracle.’ And at this he laughed,” so the notes of one present relate.[1271] Luther frequently lays it down that merry talk and good spirits are a capital remedy against temptations to doubts on the faith and remorse of conscience. He exhorts Prince Joachim of Anhalt, who had much to suffer from the “Tempter” and from “melancholy,” to be always cheerful, since God has commanded us “to be glad in His presence.” “I, who have passed my life in sorrow and looking at the black side of things, now seek for joy, and find it whenever I can. We now have, praise be to God, so much knowledge [through the Evangel] that we can afford to be cheerful with a good conscience.” It was perfectly true—so he goes on in a strangely shamefaced manner, to tell the pious but faint-hearted Prince—that, at times, he himself still dreaded cheerfulness, as though it were a sin, just as the Prince was inclined to do; “but God-fearing, honourable, modest joy of good and pious people pleases God well, even though occasionally there be a word or merry tale too much.”[1272] “Nothing does more harm than a sadness,” he declares in 1542. “It drieth up the bones, as we read in Prov. xvii. [22]. Therefore let a young man be cheerful, and for this reason I would inscribe over his table the words ‘Sadness hath killed many, etc.’” (Eccles. xxx. 25).[1273]—“Thoughts of fear,” he insists on another occasion, “are the sure weapons of death”; “Such thoughts have done me more harm than all my enemies and all my labours.” They were at times so insistent that my “efforts against them were in vain.” ... “So depraved is our nature that we are not then open to any consolation; still, they must be fought against by every means.”[1274] For certain spells, particularly in earlier years, Luther nevertheless succeeded so well in assuming a cheerful air and in keeping it up for a considerable while, in spite of the oppression he felt within, that those who came into contact with him were easily deceived. Of this he once assures us himself; after referring to the great “spiritual temptations” he had undergone with “fear and trembling” he proceeds: “Many think that because I appear outwardly cheerful mine is a bed of roses, but God knows how it stands with me in my life.”[1275]