I hold fast, Heb. I have held fast, i.e., I have not only begun well, but continued in well-doing; which is a plain evidence that I am no hypocrite. Or, the past tense is put for the future, as is usual, I will hold fast, declaratively, as before, I will maintain it, that howsoever you calumniate me, I am a righteous person. My heart, i.e. my conscience, as the heart is oft used, as 1 Samuel 24:5, 1 Samuel 25:31 Ezekiel 14:5 1 John 3:20,21. Shall not reproach me; either,
1. With betraying my own cause and innocency, and speaking what I know to be false, to wit, that I am a hypocrite. Or,
2. For my former impiety or hypocrisy, wherewith you charge me. So long as I live, Heb. from, or for, or concerning my days, i.e. the time of my life, whether past or to come. Or the course of my life; days or times being put here, as it is elsewhere, for actions done in them by a metonymy.