1.
Earthly means happening in the material world of our life on earth and not in any spiritual life or life after death.
...the need to confront evil during the ~ life...
ADJ: ADJ n
2.
Earthly is used for emphasis in phrases such as no ~ reason. If you say that there is no ~ reason why something should happen, you are emphasizing that there is no reason at all why it should happen.
There is no ~ reason why they should ever change...
ADJ: ADJ n emphasis