1. Heaven’s vengeance is slow but sure. 

2. Mills of God grind slowly but sure. 

3. Nothing so certain [sure] as death. 

4. The mills of God grind slowly but sure. 

5. God’s mill grinds slow but sure. 

6. A clear conscience is a sure card. 

7. He who fears being conquered is sure of defeat. Napoleon Bonaparte 

8. Ill weeds are sure to thrive. 

8. Sentencedict.com try its best to collect and build good sentences.

9. Death is common [sure] to all. 

10. He who follows two hares is sure to catch neither. 

11. Sure bind, sure find.

12. If you would build for your happiness a sure foundation, let the stone for the corner be a good reputation. 

13. Talk of the evil, and he is sure to appear. 

14. Truth is honest, truth is sure; Truth is strong and must endure. 

15. If nobody loves you, be sure it is your own fault. 

16. Talk of the devil, and he is sure to appear. 

17. Make sure the yard is well swilled out.

18. Make sure the tripod is stable.

19. I'm not sure. Maybe. --It's possible.

20. Are you sure these documents belong together?

21. I'm sure we'll win./I'm confident about our victory.

22. Are you sure that these measures are justified?

23. Make sure the letter is properly addressed.

24. I'm not sure of the chronology of events.

25. I'm sure he'll come with a bit of persuading.

26. Are you sure you can do it?

27. I wasn't sure whether you'd like it.

28. I'm not sure what he is thinking about.

29. This cell phone sure is hot stuff.

30. The doctor is sure he will pull through.