On conceit...
Little-minded peoples' thoughts move in such small circles that five minutes conversation gives you an arc long enough to determine their whole curve.
An arc in the movement of a large intellect does not differ sensibly from a straight line.
Oliver Wendall Holmes
... a gap-toothed and hoary ape, who now in his dotage spits and chatters from a dirtier perch of his own finding, and fouling; coryphaeus or choragus of his Bulgarian tribe of autocoprophagaus baboons.
Algernon Charles Swinburne (1837-1909) on Ralph Waldo Emerson (1803-82)
That would describe a mind thats visits any idea for the briefest of moment's and never revisit the same thought twice... the intellectual equivalent of a homeless wandering bum