Drawing on the paradox theory, the author developed a theoretical model of appraisal-motivational responses to generic paradoxical tensions. The author postulated that paradoxical tensions are appraised both as a challenge and as a threat, in turn prompting mixed effects, positive and negative, on performance. The dual effects of paradoxical tensions are explained by the intermittent role of motivation toward work and a dispositional boundary condition-individual' adaptability-cross-situation variability of behaviors. The results from an eight-wave weekly repeated measures study spanning a period of 2 months (N = 178, total observations = 1,355) provided support for the proposed theoretical model. By illuminating the nuanced intraindividual psychological process, the present study brings forward novel insights on cognitive appraisals and motivations of paradoxical tensions advancing microfoundation of the paradox research.