The texts of the Upanishads that are most obviously of benefit to man are those which teach him that he is identical with the Absolute, for the knowledge accruing from them is said to result in the 'fruit' of 'immediate intuition of truth' and 'immortality' and 'eternal freedom from fear'.
Such knowledge is not only 'fruitful' but final and uncontradictable. Once it is gained, it is inconceivable that there either should or could be any further knowledge to add to it, further it, modify it or correct it.
This cannot be said of the knowledge accruing from the creation-texts, which consequently carry less authority when they conflict with the great metaphysical teachings about the true nature of man as one with homogeneous Consciousness, the sole existent reality.
Further, if the creation-texts had been relating anything true, they would not have disagreed amongst themselves as to the details of creation. The texts that teach that the creation of the world took place on the analogy of some worldly kind of creation, such as the production of pots of showing that effects are non-different from their material cause.
And there is the further principle of exegesis that all the texts can be reconciled and combined into a single view.
According to this principle, the supreme texts of the Upanishads like 'That thou art', which affirm the identity of the individual soul with the Absolute, may be taken as fundamental, while all the rest of the texts of the Veda can be taken as auxiliaries to understanding these.
Some parts of the accounts of creation are plainly mythological, as when 'speech' is spoken of as 'desiring food' or 'food' is spoken of as 'running away'. These again should not be taken as statements of fact but as indirect aids to certain phases of the process of coming to understand the great truth that the individual soul is none other than the supreme Self
In the same way, the doctrine that, having created the world, the Absolute 'entered' it as the principle of life and consciousness is not to be taken as a statement of historical fact, but as a pictorial representation of the truth that the Absolute is already manifest in the world-appearance, in the sense that it is the only reality in it.
Both the doctrine of creation and the doctrine of the ‘entry’ of the Absolute into its own creation have to be viewed in a wider context and seen as part of the process of gradually conveying to the pupil a notion of his own true nature by the method of false attribution and subsequent denial.
Alston, Creation, p.231