ADVERBS AND INFINITIVES
296. You remember when we studied the infinitive in Lesson 9, we found that it was not good usage to split the infinitive; that is, to put the modifying word between to and the verb. For example: We ought to bravely stand for our rights. The correct form of this is: We ought to stand bravely for our rights.
But we have found, also, that common usage breaks down the old rules and makes new rules and laws for itself, and so we frequently find the adverb placed between the infinitive and its sign.
Sometimes it seems difficult to express our meaning accurately in any other way; for example, when we say: To almost succeed is not enough, we do not make the statement as forceful or as nearly expressive of our real idea, if we try to put the adverb almost in any other position. This is also true in such phrases as to far exceed, to more than counterbalance, to fully appreciate, and various other examples which you will readily find in your reading. The purpose of written and spoken language is to express our ideas adequately and accurately.
So we place our words in sentences to fulfill this purpose and not according to any stereotyped rule of grammarians. Ordinarily, though, it would be best not to place the adverb between the infinitive verb and its sign to. Do not split the infinitive unless by so doing you express your idea more accurately.