This is a reference to Muḥammad al-Bāqir's reluctance to fulfill the hopes of some of his followers who expected him to challenge the Umayyads during his time.
This source is part of the Online Companion to Hossein Modarressi, Text and Interpretation: Imam Jaʿfar al-Ṣādiq and His Legacy in Islamic Law (Harvard University Press, 2022).