All grown-ups were once children, but only few of them remember it

The Little Prince by Antoine de Saint-Exupéry — That line — "All grown-ups were once children, but only few of them remember it" — comes straight from The Little Prince, and the whole slim book is full of gems like it. It's a quick read with the author's own watercolor illustrations, and it lands differently every decade of your life. A perfect gift for a jaded adult or a curious kid.