Summary

Portrait of Charles Webster Leadbeater Charles Webster Leadbeater The Inner Life: volume II — Fifth Section…

The undeveloped causal body is the same size as any other, until the expansion begins.
As I have said, the aura of a deva has fiery characteristics which are not easy to describe, though very readily recognisable. All of the colours are more fluidic, and of the nature of flame rather than of cloud. A man looks like an exceedingly brilliant, yet delicate cloud of glowing gas, but a deva looks like a mass of fire.
The human form inside the aura of a deva is very much less defined than in a man. He lives more in the circumference, more all over his aura than a man does.
Source: Wikisource

Portrait of Charles Webster Leadbeater Charles Webster Leadbeater The Inner Life: volume II — Fifth Section…

The developed man, however, has already filled the causal body with colour, so in his case the effect produced by such a rush of affection or devotion or sympathy is not only to suffuse the body with colour and cause a great outrush of thought-forms, but also to produce a considerable temporary expansion, though the aura afterwards contracts to its normal size. Each such outrush of feeling makes the aura permanently just a little larger than before. The more it increases the more power the man has to feel.
Source: Wikisource

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