cogent - very clear, logical, convincing reasoning
incumbent - holder of an office or position
devolve - transfer, shift
concomitant - naturally associated thing

Got from Yes Minister - The Right To Know.

"Minister, the traditional allocation of executive responsibilities has always been so determined as to liberate the Ministerial incumbent from the administrative minutiae by devolving the managerial functions to those whose experience and qualifications have better formed them for the performance of such humble offices , thereby releasing heir political overlords for the more onerous duties and profound deliberations that are the inevitable concomitant of their exalted position."
-Sir Humphrey Appleby of Yes Minister.