Did medieval Judaism's greatest philosopher abandon his own foundational statement of Jewish beliefs? For centuries, scholars have debated whether Maimonides remained committed to his famous Thirteen Articles of Faith, particularly given their apparent absence from his later philosophical masterwork. Through systematic analysis of his major works—the Commentary on the Mishnah (1168), Mishneh Torah (1180), and Guide for the Perplexed (1195)—as well as his personal correspondence, this research reveals consistent affirmation of all thirteen principles across his corpus. The methodology involves comprehensive examination of doctrinal references, analyzing both direct statements and implicit theological positions. While his expression evolved to suit different audiences, Maimonides maintained unwavering commitment to all thirteen principles—from God's existence and unity to the messianic coming and resurrection. The varying presentation across his works reflects deliberate adaptation of philosophical terminology rather than doctrinal abandonment, particularly in the Guide's more philosophical treatment. This analysis demonstrates the harmonious development of Maimonides' Jewish theological philosophy, resolving a longstanding question about the intellectual consistency of medieval Judaism's most influential thinker.