"I maintain also that substances, whether material or immaterial, cannot be conceived in their bare essence without any activity, activity being of the essence of substance in general"

In this quote, Gottfried Leibniz is mentioning that all compounds, whether they are physical or abstract, can not be completely understood or conceived without considering their tasks. Tasks, according to Leibniz, are fundamental features important and are important for specifying as well as recognizing the nature important. As a result, when evaluating any type of substance, it is necessary to consider its activities in order to gain a thorough understanding of its essence.