Detailed Explanation — Wisdom (345): He said about the believer! A believer's face is filled with happiness and sadness in his heart. His courage is high and in his heart he considers himself humiliated, he hates pride and hates fame, his grief is endless and his courage is high. He is very quiet, always busy, shy, patient, absorbed in worry, miserly in raising his hand, cheerful and soft natured, and his soul is harder than a stone and more humble than a slave.

This wisdom reflects Imam Ali's (a.s.) insight into the dual emotions present in a believer's character: happiness and sadness. It suggests that while a believer may display happiness outwardly, there is often an underlying sadness in their heart. This sadness could stem from worldly struggles, the suffering of others, or personal shortcomings.

Imam Ali (a.s.) highlights the courage of a believer, which signifies their inner strength. A believer considers themselves humble, which keeps them away from arrogance and the desire for fame. This is an important lesson that one should not become proud of their achievements but should always remain humble and modest.

The wisdom also emphasizes the significance of patience, quietness, and diligence in a believer's life. These traits protect an individual from worldly temptations and provide them with the strength to remain steadfast on the path of Allah. Characteristics such as cheerfulness, gentleness, and a tough spirit reflect the spiritual growth of a believer.

This wisdom teaches us the importance of balance in a believer's character. Happiness and sadness, courage and humility, silence and diligence — all these aspects are essential in a believer's life. We should strive to adopt these qualities to become true believers.