Matthew Poole and continuators on Titus 2:7

7 In all things, shewing thy self a pattern of good works , in doctrine, showing uncorruptness , gravity , sincerity .

He is an ill Teacher of others who teacheth them not by his own Example, as well as by his Doctrine, for that Phisitian proves ordinarily little valued in his prescriptions to his Patients, whom they know to be in the same danger, and sick of the same Disease, and yet refuseth himself to use what he prescribeth others. The Patients will surely say to him, Phisician heal thy self, the Apostle therefore requires of Titus that he should be himself a pattern of Holiness, and those Ministers who are not so, vainly perswade others to be such. People (let Ministers say what they will) will believe little danger to be in those courses in which their leader himself walks.

Preaching not rotten, but sound Doctrine;

and doing it with Authority and gravity, and

sincerity; the word is [non-Latin text not transcribed] incorruptibility. It is not read in many Copies nor translated by many Interpreters, and much of the same sense with [non-Latin text not transcribed], which is the first word by our Translation interpreted uncorruptness.

Marginal references: 1 Tim. 4.12.