Here is a simple algorithm to create a password from phrases you like.
- Choose one or several sentences (quotes, sentences in a book...)
- Extract the first letter of each word
- Alternate case
- Add the number of characters of the first and last word.
"Password is a pain to remember"
To make your password secure you need to make it different for each website/account. You can for example add the first and last character of the website name.