Jamieson, Fausset and Brown on 1 Timothy 6:4

4. He is proud--literally, "wrapt in smoke"; filled with the fumes of self-conceit (1Ti 3:6) while "knowing nothing," namely, of the doctrine which is according to godliness (1Ti 6:3), though arrogating pre-eminent knowledge (1Ti 1:7).

doting about--literally, "sick about"; the opposite of "wholesome" (1Ti 6:3). Truth is not the center about which his investigations move, but mere word-strifes.

questions--of controversy.

strifes of words--rather than about realities (2Ti 2:14). These stand with them instead of "godliness" and "wholesome words" (1Ti 6:3; 1Ti 1:4; Tit 3:9).

evil surmisings--as to those who are of a different party from themselves.