The power of todays decryption technologies has overtaken our ability to memorize complex passwords. A password like King Richard would have been adequate a hundred years ago, but today it could be cracked within seconds, using a dictionary attack. Until someone invents a way to extend human memory, a password stored on a USB token or other device is the only answer with the associated risk that the device might be stolen together with your encrypted data with the password.”]
Source: https://securelist.com/when-your-brain-runs-out-of-memory/30198/