Rabbi Judah ben Bezalel Lowe, known as the Maharal of Prague was famous among Jews and non-Jews alike. He was a mystic who was revered for his holiness and Torah scholarship, as well as his proficiency in mathematics, astronomy, and other sciences. Eventually, word of his greatness reached the ears of Emperor Rudolph II.
The Emperor invited the Maharal to his castle on February 23, 1592. There they conversed for one and a half hours, and developed a mutual respect for each other.
Rabbi Judah Lowe made use of his excellent connections with the Emperor, often intervening on behalf of his community when it was threatened by anti-Semitic attacks or oppression.
We are one because we share a single soul, like a single, brilliant sun shining into many bodies. Since the soul is what counts, that makes us essentially one.
That is the meaning of the mitzvah of the Sukkah—a place that encompasses us all equally, rendering us a single whole.
We are also one because none of us are alike. Each of us reflects a different facet of that same soul, each of us with our strengths and our weaknesses, so that we all need one another to be whole and complete.
That is the meaning of the mitzvah of the Lulav, the Etrog, the Hadassim and the Aravot—four very diverse species, each containing that which the others lack.
And that is why this mitzvah is best done inside the Sukkah: To draw the oneness of our shared soul into the harmony of our diverse bodies.