That is, the “word” (v. 2). Compare “sound words” (ch. 1:13).

 Or, “healthy” (see on ch. 1:13). Only the truth will give strength and vitality to the Christian. Erroneous teachings breed quarrels and leanness of soul (cf. 1 Tim. 6:3-5; 2 Tim. 2:14, 16, 17, 23; 3:8).

That is, listen to willingly.

 The apostle was undoubtedly thinking of the great apostasy that was soon to develop in the church, and which would continue to imperil it until the second advent of Christ (see on Matt. 24:23-27; Acts 20:28-31; 2 Thess. 2:1-12; 1 Tim. 4:1-3; 2 Tim. 3:1-5).

That is, in harmony with.

 Or, “desires” (see on ch. 3:6).

That is, accumulate around themselves.

Not of the teachers, but of those who “will not endure sound doctrine,” as the Greek makes clear. Because of their perverted “lusts” these shallowminded hearers “itch” for fanciful interpretations of Scripture with which to gratify their curiosity and personal “desires.” They are interested only in those portions of Scripture they can construe as promising them peace and security. They neglect the stern demands of “sound doctrine,” which cut deep into a man’s soul. They have a superficial desire for religion, but only for so much of it as will not disturb the routine of their perverted lives.