Tafaʾul, optimistic anticipation, can lead a speaker to present a welcome future outcome as though already obtained. The form conveys confidence and emotional expectation concisely.
Example: «إِنْ وُفِّقْتُ فَقَدْ فُزْتُ» — If I am granted success, I will have attained victory. Its force may be hopeful anticipation rather than a literal statement that success has already occurred.
Strength of causes points to external grounds for assurance, whereas optimism centers the speaker's hopeful orientation toward an outcome.