hold fast to something

hold fast

1. To remain securely adhered (to something). I didn't think the makeshift weld would do the trick, but I'm happy to say that it's holding fast.
2. To remain determined, stalwart, and unyielding, as in one's position or opinion. Though it may be hard, we must hold fast in our pledge to environmental reform.
See also: fast, hold

hold ˈfast to something

refuse to stop believing in something such as a theory, principle, religion, etc: She knew that whatever happened in her life, she would hold fast to her religious beliefs.
See also: fast, hold, something