We are all philosophers, but none so extraordinary as Antoine de Saint-Exupéry, in his voice as the Little Prince. This lovely postcard bears one of the so expressive drawings and the sentiment:
It is only with the heart that one can see rightly;
what is essential is invisible to the eye
On the back of the postcard, the same thought is translated into French (the original), German, Portuguese, Dutch, Italian, Spanish and Swedish.