And tell him it's quite true that the best of the philosophers are of no use to their fellows; but that he should blame, not the philosophers, but those who fail to make use of them.
Time is not an empirical concept. For neither co-existence nor succession would be perceived by us, if the representation of time did not exist as a foundation a priori.
You will profit by the failure, and will avoid it another time. I have done a similar thing myself, in construction, often. Every failure teaches a man something, if he will learn.