98. There are two kinds of mental motions Cic. de Off. I. 36, § 132.—those of reflection and of passion. The one has to do with reflection, the other with passion. There is no confusion one with the other, for they are markedly different and unlike. Reflection has to search and as it were to grind out the truth. Passion prompts and stimulates us to do something. Thus by its very nature reflection diffuses tranquillity and calm; and passion sends forth the impulse to act. Let us then be ready to allow reflection on good things to enter into our mind, and to make passion submit to reason (if indeed we wish to direct our minds to guard what is seemly), lest desire for anything should shut out reason. Rather let reason test and see what befits virtue.