Love must be unconditional.
To feel true love is to know the Creator. Therefore, it is expected that one's first love is to be the Great Spirit. He is considered the father of all children, and the giver of human life. Love given to the Great Spirit is expressed through love of oneself, and it is understood that if one cannot love oneself, it is impossible to love anyone else.
The Eagle was chosen by the Great Spirit to represent this law, as the Eagle can reach the highest out of all the creatures in bringing pure vision to the seeker. Although the supplier of the greatest and most powerful medicine, love can also be the most elusive of the teachings, as it depends upon a world that acknowledges the importance of spirituality.