The more the source language differs from the target language, the more difficult it may be to understand a literal translation without modifying or rearranging the words in the target language. On the other hand, formal equivalence can allow readers familiar with the source language to analyze how meaning was expressed in the original text, preserving untranslated idioms, rhetorical devices (such as chiastic structures in the Hebrew Bible) and diction in order to preserve original information and highlight finer shades of meaning.