The document examines the satipaṭṭhāna sutta, suggesting it may not be an authentic discourse of the Buddha but rather a compilation with sectarian bias favoring pure vipassanā practice. It discusses the evolution of mindfulness in early Buddhism, highlighting how the Buddha initially introduced kāyagatā sati and later developed it into the four satipaṭṭhānas. The document also compares the contents of satipaṭṭhāna across seven major texts using textual analysis and psychological approaches.