1. Gandalf maximizes his chances for chance enounters by staying in circulation
and mingling freely with all the peoples of the region, unlike Saruman locked
in his tower or Radagast who prefers the company of animals.
2. Probably Eru himself is exerting his influence, although he remains a
mystery. (Not even the Valar seem to fathom him, as shown by the Dwarf-creating
incident and the Melkor unpleasantness.)
3. Chance is a word we use when we don't know or understand the
cause.
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