Here's some threads. I think you have to read that passage in its surrounding context and keep in mind that the book of Hebrews was intended to encourage believers who were facing severe persecution. I think the REALLY difficult part about the passage is that the writer seems to be explaining that the Lord is using the persecution to discipline and purify the believers.
http://www.gentlechristianmothers.co...light=chastens
http://www.gentlechristianmothers.co...light=chastens
http://www.gentlechristianmothers.co...light=chastens (possibly updates information from above thread.)
http://www.gentlechristianmothers.co...light=chastens