on idle words

i got this from a book entitled 'the spiritual exercises of st. ignatius' which i bought almost two weeks ago. though it's a spiritual reading the practical side of it is very useful in day to day living especially in a world dictated by words and noise. here it is:

'no idle word should be uttered. i understand a word to be idle when it serves no good purpose, either for myself or for another, and was not intended to do so. hence, words are never idle when spoken for any useful purpose, or when meant to serve the good of one's own soul or that of another, of the body or of temporal possessions. nor are they idle because one speaks of matters

that do not pertain to his state, for example, if a religious speaks of wars or of commerce. in all we have mentioned, there will be merit if what is said is directed to some good purpose; there will be sin if it is directed to an evil purpose, or if engaged in for no good end. '