A brilliant introduction to this often intimidating course! Abbott provides context and an authorial voice that brings the subject alive. Real Analysis is often thought to be the driest of math courses; in Abbott's hands, it is as provocative as it is necessary. We really do need epsilon and delta, because our intuition can lead us terribly astray when we encounter the infinite and the infinitesimal! What's the best use of this text? I'm not sure: I teach high school, so I am not burdened with having to make it stand in for a college text. If the goal is to create a lasting understanding of  this foundational topic, then this is the book for you. I will never teach Calculus the same after reading this.