How are language and thought related to each other?

How are language and thought related to each other?

Language and thought may be viewed as two independent circles overlapping in some parts, where language and thought are consistent with each other and one never occurs without the other. When language and thought are identical or closely parallel to each other, we may regard thought as "subvocal speech”, and speech as "overt thought”. In such a case, speaking and thinking take place simultaneously.