My favorite author as a child, Roald Dahl’s books filled my imagination with tales of wonder and adventure while teaching me important life lessons about kindness, independent thought, and humility. Nearly 20 years after his passing, this brilliantly insightful man is still inspiring the minds of people young and old, and his writing is just as relevant as ever.

Image credits: Shutterstock

As well as whimsical classics such as The BFG, Charlie and the Chocolate Factory and Matilda, Dahl penned a few essays in the interest of public health and safety. This heartbreaking letter about the tragic death of his daughter Olivia, who passed away in 1962 from complications of the measles virus, is essential reading for those of you in doubt about vaccinating your children.

Image credits: wikipedia

Here’s what people had to say about the powerful letter