Ajahn Brahm is taking a classic text compiled by the Venerable Nyanatiloka titled the “Word of the Buddha” which provides a staged summary of the Buddha Dhamma. But Ajahn Brahm is heavily revising the text to bring it up to date with contemporary English language usage. 
Ajahn translates the pali sentence by sentence instead of word for word to make it powerful and accessible for us to understand. A link to the translation can be accessed here.
This is Part 12. Find the full series here.
Ajahn Brahm has given previous teachings on the Word of Buddha: https://bswa.org/teachings/
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To find and download more precious Dhamma teachings, visit the BSWA teachings page: https://bswa.org/teachings/, choose the teaching you want and click on the audio to open it up on Podbean.