Validity has long held a venerated place in education, leading some authors to refer to it as the "sine qua non" or "cardinal virtue" of assessment. And yet, validity has not held a fixed meaning; rather it has shifted in its definition and scope over time. In this Eye Opener, the authors explore if and how current conceptualizations of validity fit a next era of assessment that prioritizes patient care and learner equity. They posit that health profession education's conceptualization of validity will change in three related but distinct ways. First, consequences of assessment decisions will play a central role in validity arguments. Second, validity evidence regarding impacts of assessment on patients and society will be prioritized. Third, equity will be seen as part of validity rather than an unrelated concept. The authors argue that health professions education has the agency to change its ideology around validity, and to align with values that predominate the next era of assessment such as high-quality care and equity for learners and patients.