Trotsky and several other Soviet figures promoted the idea that Stalin was a mediocrity. This gained widespread acceptance outside the Soviet Union during his lifetime but was misleading. According to biographer Montefiore, "it is clear from hostile and friendly witnesses alike that Stalin was always exceptional, even from childhood". Stalin had a complex mind, great self-control, and an excellent memory. He was a hard worker, and displayed a keen desire to learn; when in power, he scrutinised many details of Soviet life, from film scripts to architectural plans and military hardware. According to Volkogonov, "Stalin's private life and working life were one and the same"; he did not take days off from political activities.