We forget things. There’s a time when we want to search for a full sentence that we read before but can’t remember the full line with the correct wording here and there. To look up its original complete form or the author of it so that we can quote the literature, we have come to Google.
One idea it to just enter to Google the words we have left in our memory for the sentence, but a better approach is to use the asterisk / wildcard substitute, so that Google instead of giving the general results of a weirdly worded phrase (actually sentence fragments with some words or phrases missing), it tries to find any results with one or more words in the place of the asterisks:
To * or not to *