we as mortals could never understand their reasons for in a way they have the picture of all that is to happen in front of them and know that if they interfere to much the consquences are unimangible and they are responsible to eru in a way. since they cannot interfere to much they sent the istari in the form of mortals so that they could better understand the plights of the mortals they were sent to help
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All that is gold does not glitter,
Not all that wander are lost;
The old that is strong does not wither,
Deep roots are not reached by the frost.
From the ashes a fire shall be woken,
A light from the shadows shall spring;
Renewed shall be blade that was broken,
The crownless again shall be king.
Bilbo Baggins Describing Aragorn Son of Arathorn Heir of Elendil,Elessar-Elfstone of his people
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