Being open-minded is not so easy when we live in a society full of divides, damaged by tensions, prejudices and incomprehension. We find many difficulties in making our diversity a richness.The objective of this small book is not to give lessons of philosophy or morale, but to enumerate a few tools that will enable us to be less complaisant in our certainties. Open-mindedness is not decreed, it is worked on. Let’s pull up our sleeves!