Those who believe that Greece will pay its debts are dreaming. Read this.
That's what the Greek government bond yield is telling you. At 17% vs 3% on German bonds, either Greece will pay its bonds in deflated drachmas after it's left the euro zone, or it will repay them in long-dated euro "restuctured" low-interest bonds after lenders have taken a "haircut", or it won't repay them at all. The odds (for now) are still on the second option. The Greek parliament is meeting as I write this.
Disclaimer. After nearly 40 years managing money for some of the largest life offices and investment managers in the world, I think I have something to offer. These days I'm retired, and I can't by law give you advice. While I do make mistakes, I try hard to do my analysis thoroughly, and to make sure my data are correct (old habits die hard!) Also, don't ask me why I called it "Volewica". It's too late, now.
BTW, clicking on most charts will produce the original-sized, i.e., bigger version.