Which preposition to use with externalization

of Occurrences 4%

We have found that in this way the externalization of the idea progresses from the condensation of the primary nebula to the production of human beings as a race, and that at this point the simple generic reproduction of the idea terminates.

by Occurrences 1%

This is according to the strictly scientific conception of the universal law of growth; and we may therefore briefly sum up the whole argument by saying that our thought of anything forms a spiritual prototype of it, thus constituting a nucleus or centre of attraction for all conditions necessary to its eventual externalization by a law of growth inherent in the prototype itself.

Which preposition to use with  externalization