Why was Gandalf afraid of Sauron?

Related questions

1. Why was Ian McKellen not Dumbledore?
2. Is Galadriel stronger than Sauron?
3. Why did Sauron make the ring?
4. What is Sauron's eye?
5. Is the Mouth of Sauron a Nazgul?
6. Why does Gandalf have elven ring?
7. What race is the Mouth of Sauron?
8. What religion is Ian McKellen?
9. Is the Eye of Sauron Sauron himself?
10. How tall is Gandalf?

Tags

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2. #going
3. #powerful
4. #earth
5. #concerned
6. #large
7. #directly
8. #wouldn
9. #middle
10. #afraid
11. #downfall
12. #gandalf
13. #against
14. #enough
15. #because
16. #courage
17. #manwe