Greeks first started as a society that was based firmly in polytheism. God's represented natural features and disasters, things they feared and things they loved. The big three were: Poseidon the god of the sea, Hades the god of the underworld, and finally the most prominent Zeus the god of the sky. These gods and their heroes still didn't fulfill gaps. They were not perfect and if they were all powerful why would they mess with human life? Thus the first philosophers needed to explain the gaps. They decided to brake tradition and form some of the earliest philosophers. Early philosophers tried to explain what was happening around them by using science, reason, and observation. Many philosophers are known today such as Socrates and Plato. Both of whom started their own schools and were well accepted by the people and as the oracle at the time said the smartest and wisest of their times.
Who are we?
How can we be happy?
Does the universe have a purpose?
These are just a few questions that frequented talks among philosophers. Philosophers in the Grecian era frequently debated other philosophers and even normal civilians asking questions like this in Greek life.