One of the common complaints of many of us Muslims is that when we make Dua, we dont see its immediate effects. As a result, we get disheartened and lose hope in the effectiveness and powers of our Dua. The post below highlights a passage written by Ibn Al-Jawzi (may Allah have mercy on him) where he discusses this topic.
The remembrance of Allah calms and fortifies the soul. It cultivates fortitude and perseverance, moderates impatience, and repels depression and despair.