another thing that deters from zeal is increasing fear- and the magnitude of fright- beyond what is demanded, regarding time and what it may produce" meaning- whatever is renewed with time and that which is produced with time...what does this mean? "so that at one time one will be afraid of cold or heat, or of accidents" at another of illnesses, at another of the wind, and so on and so forth" meaning- if he's constantly looking for all the aspects to be perfect, and only then will he do something- so he will be unsuccessful- as we've previously seen.