Śrī Caitanya-caritāmṛta - Ādi-līlā 4.199-201

"The happiness of the abode of love is in the happiness of the object of that love. This is not a relationship of desire for personal gratification."

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"Whenever there is unselfish love, that is its style. The reservoir of love derives pleasure when the lovable object is pleased. When the pleasure of love interferes with the service of Lord Kṛṣṇa, the devotee becomes angry toward such ecstasy."

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Śrī caitanya-caritāmṛta Ādi 4.199 & 200-201