Musar zu Ijow 22:28

Everyone who speaks the truth in his heart and does not want even to think falsely, even without meaning to do so, his words and his thoughts will be fulfilled, as it is said, "Thou shalt also decree a thing, and it shall be established unto thee" (Job 22:28). And he who is a man of truth, in every transaction of his, whether it be in buying or selling, or in loaning, should express his full intention at the outset, and he should accustom all those who do business with him to know that he will not alter, that he will not add to or diminish from the terms agreed on. The wise man said, "Always place the truth before you." By this he meant that a man ought to make certain signs for himself, for example, in business matters that he remember not to speak falsehood. And he should put this down in writing, and he should bring this writing with him and he should look at it before he begins his transaction. He should write something when he sits in his study, and at his table, that he should remember not to speak falsehood, and that he may not forget to speak the truth. And so did one person do. He wrote on the walls of his house, and in his study on the upper part of all the walls: "Remember the day of death, and you will not sin." And he who does not speak anything but the truth will live, and live long, and be free.