n. 25B6; noun
the pith of the argument : ESSENCE, main point, fundamentals, heart, substance, nub, core, quintessence, crux, gist, meat, kernel, marrow, burden; informal nitty-gritty.
he writes with pith and exactitude : SUCCINCTNESS, conciseness, concision, pithiness, brevity; cogency, weight, depth, force.