How admirably Ps. 39 [38] takes the place of an introduction. Incited thereto by this psalm the saint determines to write on duties. He does this with more reason even than Cicero, who wrote on this subject to his son. How, further, this is so. 23. NOT without thought did I make use of the beginning of this psalm, in writing to you, my children. For this psalm which the Prophet David gave to Jeduthun to sing,1 I urge you to regard, being delighted myself with its depth of meaning and