Sermon 90 is set in the historical context following the assassination of Uthman, when there was significant political and social turmoil among Muslims. Imam Ali (a.s.) expressed his reluctance to accept the caliphate and emphasized the complexity and sensitivity of the situation.

The main themes of this sermon include the heavy burden of leadership, which Imam Ali (a.s.) was hesitant to accept, and the intricate political circumstances of the time. He pointed out that the matter had many aspects that neither hearts could bear nor intellects could accept.

Key phrases such as "If I accept this wish of yours, I will lead you on the path that is in my knowledge" highlight his awareness and insight regarding leadership. He also mentioned that if he were left alone, he would be like them, indicating that he prioritized the public's interests over his position.

The moral and spiritual lessons conveyed here include the understanding that leadership is not an easy task and requires wisdom and knowledge. Imam Ali (a.s.) clarified that true leadership should focus on the welfare of the people. Practical takeaways include the importance of making informed decisions when selecting leaders, rather than relying solely on apparent worldly benefits.