What does the Rebbe teach about the importance of joy in avodas Hashem even amid difficulty?

What does the Rebbe teach about the importance of joy in avodas Hashem even amid difficulty?

The Rebbe teaches that observing the world with happiness is crucial, and that intensifying one's study of Chassidus can infuse light and vitality, leading to a redoubled ardor to serve Hashem joyfully [1], [5]. Just as in physical wrestling, laziness and sluggishness lead to defeat, so too in conquering one's evil nature, it is impossible to succeed without joy [4].

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