[who_would_fardels_bear]

The three great philosophical questions are:

1. What can we know? (Epistemology)

2. What is there? (Ontology)

3. What should we do? (Ethics)

There is also a fourth question you can add: What is beauty? (Aesthetics) so that the three basic philosophical concepts of truth, goodness, and beauty are covered.

There are lots of good answers here:

Stanford Encyclopedia of Philosophy

This is a great research site that is friendly to both non-Christian and Christian philosophers and philosophies.

[EaglesNestHome]

Yes, those are great questions—when it comes right down to it, these are key to happiness and fulfillment in life. What say you, personally?

[cornelis]

The four great purposes are:

1) to please

2) to instruct

3) to seek

4) to worship