Why did Adam Smith describe his time at Glasgow as the happiest period of his life?

Adam Smith described his time at the University of Glasgow as the happiest and most honorable period of his life because it was a time of extraordinary creativity, characterized by a vibrant social and intellectual environment.1

During this period, Smith balanced his academic responsibilities—which included lecturing to students and serving as dean of faculty—with a stimulating social life. He engaged with a wide circle of notable figures, including the chemist Joseph Black, the engineer James Watt, the publisher Robert Foulis, and his lifelong friend, the philosopher David Hume.1

Furthermore, Smith benefited from his interactions with prominent merchants involved in Scotland's colonial trade. These relationships provided him with the detailed, practical insights into business and trade that would later inform his seminal work, The Wealth of Nations.1