Sweetness and Joy in Difficulty

How can one feel sweetness and joy when one is in difficulty?

Exactly, when the difficulty is egoistic or personal, if one makes an offering of it and throws it into the fire of purification, one immediately feels the joy of progress. If one does it sincerely, at once there is a welling up of joy.

That is obviously what ought to be done instead of despairing and lamenting. If one offers it up and aspires sincerely for transformation and purification, one immediately feels joy springing up in the depths of the heart. Even when the difficulty is a great sorrow, one may do this with much success. One realises that behind the sorrow, no matter how intense it may be, there is a divine joy.

Ref : Questions and Answers 1956