On the question why certain Names in the Holy Scriptures are changed (161-165)

And the soul is subject to many things of much the same kind. For when something good is hoped for it rejoices beforehand, so that in a manner it rejoices before its joy, and is delighted before its delight. And one may also compare this to what happens with respect to plants; for they, too,

Look at the cultivated vine, how marvellously it is furnished by nature with young shoots, and tendrils, and suckers, and leaves redolent of wine, which, though they utter no voice, do nevertheless indicate the joy of the tree at the coming fruit. And the day also laughs in anticipation of the early dawn, when the sun is about to rise; for one ray is a messenger of another, and one beam of light, as the forerunner of another though more obscure, is still a herald of that which shall be brighter.

Therefore, joy accompanies a good when it is already arrived, and hope while it is expected. For we rejoice when it is come, and we hope while it is coming; just as is the case also with the contrary feelings; for the presence of evil brings us grief, and the expectation of evil generates fear, and fear is nothing more than grief before grief, as hope is joy before joy. For the same relation that, I imagine, fear bears to grief, that same does hope bear to joy.

And the external senses afford very manifest proofs of what has now been said; for smell, sitting as it were in front of taste, pronounces judgment beforehand on almost every thing which is eaten and drunk; from which fact some persons have very felicitously named it the foretaster, having a regard to its employment. And so hope is by nature adapted to have as it were a foretaste of the coming good: and to represent it to the soul, which is to have a firm possession of it.

Moreover, when any one who is engaged in a journey is hungry or thirsty, if he on a sudden sees a fountain or all kinds of trees weighed down with eatable fruits, he is at once filled with a hope of enjoyment, not only before he has either eaten or drunk, but before he has either come near them or gathered of them. And do we then think that we are able to feast on the nourishment of the body before we receive it, but that the food of the mind is not able to render us cheerful beforehand, even when we are on the very point of feasting on it?