This has been written in simple language, so that the schoolboy and non-expert can use it.
The selection of experts by the non-expert can be wise only by accident.
To the non-expert, however, this perfected form is a stumbling block.
It seems to me, the whole thing, very neatly and tactfully done for an amateur, a non-expert.
late 14c., from Old French expert and directly from Latin expertus, past participle of experiri "to try, test" (see experience). The noun sense of "person wise through experience" existed 15c., reappeared 1825. Related: Expertly.