We endured the time of your setting sun, but O sky, this deceitful play will not be fulfilled.

This couplet is a powerful declaration of resilience. The speaker acknowledges the immense pain, the 'burning heat' of the beloved's love, which they have already endured. However, the second line is a defiance—a challenge to fate itself. The poet asserts that no matter how cruel or intricate the scheme of destiny (Falak) might be, the speaker's spirit will remain unbroken. It is a declaration of ultimate emotional survival.