and when they had fulfilled the days, as they were returning, the boy Jesus stayed behind in Jerusalem. Joseph and his mother didn't know it,
      2. That his mother, though she did not perfectly understand her son's sayings, yet kept them in her heart, expecting that hereafter they would be explained to her, and she should fully understand them, and know how to make use of them. However we may neglect men's sayings because they are obscure (Si non vis intelligi debes negligi--If it be not intelligible, it is not valuable), yet we must not think so of God's sayings. That which at first is dark, so that we know not what to make of it, may afterwards become plain and easy; we should therefore lay it up for hereafter. See John 2:22. We may find use for that another time which now we see not how to make useful to us. A scholar keeps those grammar rules in memory which at present he understands not the use of, because he is told that they will hereafter be of use to him; so we must do by Christ's sayings.