_Attention is the power by which we impress upon our mind that which is present._ ix. Memory _Memory is the power by which we retain or recall to our mind that which is past._ x. Imagination _Imagination is the power by which we combine or vary the mental images retained by Memory, often with a view to finding some unity in them; and by which we are enabled to image forth the future through anticipating its harmony with the past and present._ xi. Reason _Reason (or, as some prefer to call it in this limited sense, Understanding) is the power by which we compare, and, from our comparisons, draw inferences or conclusions. By means of it we compare the suggestions of the Imagination with the suggestions of Experience, and accept or reject the former in accordance with the result of our comparison._ xii. Hope _Hope is desire, of which we imagine the fulfilment, while recognizing the presence of doubt._ xiii. Faith The following Definition appears to me to be the basis of all theology. It is no more than an emphatic restatement of the old saying, “Faith is the _assurance of_ (or _giving substance to_) things _hoped for_.” Since _hope_ is but a weaker and more hesitant form of _desire_, the _imaging forth of_ (or _giving substance to_) things earnestly _hoped for_ must imply the vivid _imagination_ of the fulfilment of things _desired_. _Faith (when not loosely used for Belief) is desire (approved by the Conscience) of which we imagine the fulfilment, while putting doubt at a distance._ “_Faith_ in a friend” means a _desire_ as well as a belief—that he will do what you think he ought to do. “Faith” should never be used to express a belief that something undesirable or wrong will happen, _e.g._ “I have great _faith_ that the boy will go wrong.” “Faith” in the uniformity of Nature implies a desire that Nature should be uniform, and a feeling that it is God’s will. In moments when we dread the uniformity of Nature we should say that we have a “conviction” or “expectation” of it, not that we have “faith” in it. “Putting doubt at a distance is intended to include the different degrees of faith: in the highest faith, the ‘distance’ is infinite. “When ‘faith’ is said to be ‘shaken,’ we may mean that, though the desire may remain, doubt is not ‘put at a distance;’ or that the Conscience no longer approves of the desire; or that the desire itself is weakened.” xiv. Belief _Belief (when it is not used for Faith) means a sense, mixed with doubt, that the affirmations of our mind will harmonize with Experience._[41] xv. Certainty, or Conviction