In Sermon (155), Imam Ali (peace be upon him) sheds light on the instability of the world and the testimony of human limbs and organs. This sermon was delivered in a historical context where the Muslim community was facing various challenges, and there was a need for people to understand the reality of the Hereafter. Through this sermon, the Imam reminds people that the world is transient and its pleasures are temporary.

Imam Ali (peace be upon him) states that the state of the world does not remain the same, and those who get engrossed in it become entangled in misguidance instead of nurturing their souls. A key theme of this sermon is piety, which the Imam describes as a strong fortress. Piety protects a person from sins and leads them towards Allah's mercy.

Addressing his followers, the Imam emphasizes the importance of fearing for one's own soul, which is the most cherished thing. He stresses the need for preparing for the Hereafter, as life in this world is fleeting. The sermon also highlights that a person's limbs and organs will testify to their actions, which will be accounted for on the Day of Judgment.

This sermon serves as a message for spiritual awakening. Imam Ali (peace be upon him) reminds people that each individual’s conscience is their guardian, and Allah has endowed every person with a conscience to keep track of their actions. Furthermore, the Imam points to the transitory nature of this world and the eternal reality of the Hereafter, urging individuals to reflect on their deeds and learn from the lessons of life.

Practically, this sermon teaches us that instead of getting lost in worldly pleasures, we should prepare for our Hereafter. We must adopt piety in our lives and monitor our actions so that we may become deserving of Allah's mercy on the Day of Judgment.