through the hypocrisy of men who speak lies, branded in their own conscience as with a hot iron;
To be prepared for this task, Timothy must nourish his mind upon the "words of faith and good doctrine" and continue to lay these things before the brethren as he has already been doing (verse 6). He must not, however, allow himself to be carried away with religious trivialities and inanities that are not even worthy of consideration (verse 7). Instead, he must exhaustively train himself for godly living. It is not physical exercise that Paul encourages, for it is of but little value and that only temporarily; but it is exercise unto godliness that is profitable both in this life and in that which is to come (verse 8). So certain is this fact that it is a generally known saying among Christians everywhere (verse 9). Because of the importance of godliness, both Paul and Timothy labored unto weariness and strove agonizingly to live godly lives, trusting in the living God who preserves all men in their lives and especially preserves believers who are saved eternally (verse 10).