Animals do not gaze in wonder at the stars and angels are confined to the realm of the spirit, but the human being is G‑d’s bridge between heaven and earth.
Our bodies are formed from the dust; our souls are of the essence of G‑d. We alone can look at a physical world and see spiritual life and beauty. We who are beyond both heaven and earth, form and matter, spirit and body—we alone can fuse the two.

Our mind and heart dwell in a physical place called 'earth'. This pertains to our natural quality of egoism.
G_d 's quality is defined as 'heaven'. A place where altruism reigns.
Our work is to form a bridge between our nature and His. We can only work with what we have.
We fuse the opposite qualities by using our need for self gratification in a way that includes G_d's quality to provide for others.
In this way we build our soul which transcends our earthy nature and G_d's heavenly nature: We receive what we need and then spread that resource to the whole network. This is similar to how a healthy body works. Each organ takes what it needs from it's role and then passes it's resource to the whole body. Both receiving and giving qualities are integrated to satisfy yourself and the whole network to create a perfect harmonious Soul.