Similar words: too much of a good thing, it is understood that, seeing that, granting that, assuming that, providing that, living thing, a good turn.
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1. It's a good thing that when God created the rainbow he didn't consult a decorator or he would still be picking colors. Sam Levenson 
2. I decide it's a good thing that I don't see Sean try to capture Ian's incandescent dance.
3. It's a good thing that I wasn't there.
4. Perhaps it's a good thing that Dizzy retired.
5. It's a good thing that New Year's was a holiday because everyone had a hangover.
6. It's a good thing that you have finished with that worthless young man.
7. It's a good thing that other countries are becoming spacefaring nations. No fear of any one nation dominating space as private companies are getting into the race as well.
More similar words: too much of a good thing, it is understood that, seeing that, granting that, assuming that, providing that, living thing, a good turn, good through, on the understanding that, bloodthirsty, have a good time, good-for-nothing, good for nothing, this and that, in good time, in good taste, with a good grace, thatching, good time, good-time, good turn, good temper, good title, it has been announced that, good-tempered, and that, keep good time, nothing to speak of, lengthily.