How does the Holy Spirit bear witness to our hearts in a Protestant lens?

Some Protestants adhere to the Westminster Confession of faith. This quotation "our full persuasion and assurance of the infallible truth and divine authority thereof, is from the inward work of the Holy Spirit, bearing witness by and with the Word in our hearts." How does the Holy Spirit bear witness to our hearts the infallible truth and divine authority of the Bible? How would one describe and discern that experience? How would one experience such a witness? Thank you.