Implied is that there is true godliness b. He strengthens us by His Spirit in the inner man - cf. Just as physical exercise provides benefit for healthy living b. Even more so, spiritual exercise provides benefit for godly living 2. The type of spiritual exercise needed - cf.
Many people are pious, having a form of godliness, but for the wrong reason a.
They view it as a means of gain - cf. For some, to get wealthy c. For others, to get healthy d. For others, to get popularity 2. There is only one proper motive for pious conduct a.