In this article I analyse how evidence influences, determines and evaluates belief formation. I deal with the main normative accounts and with constitutive nonnormative accounts of the evidential thesis for belief emergence and I finally defend that evidentialism must be understood in constitutive non-normative terms. More specifically, evidentialism must be based on the idea that believers always consider that they have enough evidence for their beliefs.En este artículo analizo cómo la evidencia influye, determina y evalúa la formación de la creencia. Trato las principales visiones normativas y constitutivas no normativas sobre la tesis evidencialista para la emergencia de creencias y finalmente defiendo que el evidencialismo debe ser ente...