You can have blank spaces in passwords. common password lists very rarely have them and longer passwords are better. Though a famous quote will be worse than something more personal or more random.
What I don’t recommend is using them at the start or end of a password. Applications routinely strip white space from the start and end of submitted strings and it’s very easy for a developer to forget to make an exception for passwords (or not realize they’re supposed to) and you may find your password doesn’t work (potentially after an update).
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