A silver lining exists even in the darkest cloud.

(ঘন অন্ধকারেও আশার আলো প্রজ্বলিত থাকে)

The meaning of this expression is that there is always a comforting or more hopeful side to a sad or difficult situation. Life has its ups and downs. When a man finds any difficulty or obstacle in his way of life, he becomes depressed. But it should be remembered that happiness or prosperity is not an unmixed blessing. Both weal and woe are mixed up in our life situation. Sorrows and happiness come by turns. Its example can be found in nature. The cloud in the sky cannot block the rays of the sun for long. Everyone can find that in the border of patches of cloud, a sunny lining which indicates that sunlight will soon be seen. So, there should have no frustration and disappointment at the time of danger and sorrows since all these will be removed with new hopes and happiness.