The discussion centers on the accessibility and difficulty of advanced calculus texts for high school students interested in a rigorous understanding of the subject. Participants agree that while both Courant and Spivak are valuable resources, they cater to different audiences. Spivak is noted for being more user-friendly and aimed at pure mathematicians, while Courant offers more applications to physics. The difficulty level of these texts is acknowledged to be higher than standard calculus books, with an emphasis on mathematical proofs, which can be challenging but rewarding. A suggestion is made to read the first chapter of Courant as a litmus test for suitability. Additionally, an alternative text, "A First Course in Real Analysis" by Protter and Morrey, is recommended for its clarity and manageable exercises, making it a good option for beginners. Overall, both Courant and Spivak are considered valuable, with the choice depending on the student's interests and background in mathematics.