And this is the only way to capture the attention of a witness. If he is merely ordered to pay attention, the result is the same as if he were ordered to speak louder,--he does it, in lucky cases, for a moment, and then goes on as before. Attention may be generated but not commanded, and may be generated successfully with everybody, and at all times, if only the proper method is hit upon. The first and absolute requirement is to have and to show the same interest oneself. For it is impossible to infect a man with interest when you have no interest to infect with. There is nothing more deadly or boresome than to see how witnesses are examined sleepily and with tedium, and how the witnesses, similarly infected, similarly answer. On the other hand, it is delightful to observe the surprising effect of questions asked and heard with interest. Then the sleepiest witnesses, even dull ones, wake up: the growth of their interest, and hence of their attention, may be followed step by step; they actually increase in knowledge and their statements gain in reliability. And this simply because they have seen the earnestness of the judge, the importance of the issue, the case, the weighty consequences of making a mistake, the gain in truth through watchfulness and effort, the avoidance of error through attention. In this way the most useful testimony can be obtained from witnesses who, in the beginning, showed only despairing prospects. Now, if one is already himself endowed with keen interest and resolved to awaken the same in the witnesses, it is necessary carefully to consider the method of so doing and how much the witness is to be told of what has already been established, or merely been said and received as possibly valuable. On the one hand it is true that the witness can be roused to attention and to more certain and vigorous responses according to the quantity of detail told him.[67] On the other, caution and other considerations warn against telling an unknown witness, whose trustworthiness is not ascertained, delicate and important matters. It is especially difficult if the witness is to be told of presuppositions and combinations, or if he is to be shown how the case would alter with his own answer. The last especially has the effect of suggestion and must occur in particular and in general at those times alone when his statement, or some part of it, is apparently of small importance but actually of much. Often this importance can be made clear to the witness only by showing him that the difference in the effect of his testimony is pointed out to him because when he sees it he will find it worth while to exert himself and to consider carefully his answer. Any one of us may remember that a witness who was ready with a prompt, and to him an indifferent reply, started thinking and gave an essentially different answer, even contradictory to his first, when the meaning and the effect of what he might say was made clear to him.