Detailed Explanation — Wisdom (312): Your messenger is the interpreter of your intellect and the most successful interpreter on your behalf is your letter.

In Wisdom (312), Imam Ali (a.s.) highlights the fluctuating nature of the human heart. This saying indicates that the heart can be inclined towards one thing at times and disinterested at others, reflecting the emotional and spiritual states of a person. This is a significant aspect of human psychology, demonstrating how one's spiritual condition can influence their acts of worship and actions.

Imam Ali (a.s.) advises that when the heart is inclined, meaning when a person is spiritually uplifted or eager for worship, they should be encouraged to engage in mustahabb (voluntary) acts of worship. This implies that when one's spiritual state is positive, they should strive to perform as many voluntary acts as possible to strengthen their faith further.

Conversely, when the heart is disinterested, indicating a weak spiritual state or lack of focus on worship, one should limit themselves to the obligatory (fard) acts of worship. The aim here is to ensure that one does not abandon their worship entirely, even if their heart is not inclined towards it. This practical wisdom teaches us to maintain our acts of worship regardless of our emotional states.

This wisdom also emphasizes the importance of being mindful of the heart's condition. One should strive to understand their spiritual state and adjust their actions accordingly. This self-awareness aids individuals in improving their worship and spiritual connection, regardless of the ups and downs they may experience in their hearts.