Mendelssohn later had reason to thank Lavater for having through thoughtlessness or pious cunning drawn him out of his diffidence and seclusion. Mendelssohn had indeed expressed his relations to Judaism and his co-religionists so vaguely that onlookers might have been misled. In public life he was a philosopher and an elegant writer, who represented the principles of humanity and good taste, and apparently did not trouble about his race. In the darkness of the Ghetto he was a strictly orthodox Jew, who, apparently unconcerned about the laws of beauty, joined in the observance of every pious custom. Self-contained and steadfast though he was in reality, he seemed to be a twofold personality, revealing the one or the other as he was in Christian or in Jewish society. He could not stand up in defense of Judaism without, on the one hand, affronting Christianity by his philosophical convictions, and, on the other, showing, if ever so lightly, his dissatisfaction with the chaotic traditions of the synagogue, and so offending the sensibility of his co-religionists and quarreling with them. Neither of these courses, owing to his peace-loving character, entered his mind. He would have been able to pass his life in an attitude of silence, if Lavater's rude importunity had not dragged him out of this false position, altogether unworthy of a man with a mission. Painful as it was to reveal his innermost thoughts upon Judaism and Christianity, he could not hold his peace at this challenge, without being considered a coward even by his friends. These reflections weighed heavily upon him, and caused him to take up the glove. He skillfully carried on the contest thus forced upon him, and was ultimately victorious. At the end of 1769, in a public letter addressed to Christendom and Lavater, its representative, Mendelssohn in the mildest form wrote most cutting truths, whose utterance in former times would inevitably have led to bloodshed or the stake. Mendelssohn had examined his religion since the days of his youth, and found it true. Philosophy and _belles-lettres_ had with him never been an end, but the means to prepare him for testing Judaism. He could not possibly expect advantage from adherence to it; and as for pleasure-- "O my worthy friend, the position assigned to my co-religionists in civil life is so far removed from all free exercise of spiritual powers, that one's satisfaction is not increased by learning the true rights of man. He who knows the state in which we now are, and has a humane heart, will understand more than I can express." If the examination of Judaism had not produced results favorable to it, what would have chained him to a religion so intensely and universally despised, what could have prevented him from leaving it? Fear of his co-religionists, forsooth? Their secular power was too insignificant to do any harm.