Some of the philosophical questions which are supposedly difficult to answer are:
1. Who or what determines right from wrong?
2. What comes first, the chicken or the egg?
3. If there is an all-seeing, all knowing, and all-capbale Creator, why did He create imperfect creatures?
4. What happens after we die?
The answers to all of these "deep" philosophical questions can be found in the Bible. If you take God at his Word, they are not difficult at all.
There are other philosophical questions which are more abstract such as "Why don't we have all the answers?"
Eve's desire to know the unknown was part of the original sin that created the mess we're in and actually resulted in more questions than answers. But then, would you really want to have all the answers? I don't. It would save me a lot of work if some of the answers were easier to find but we would be bored stiff if we had all the answers. There would be no need for education or research. Wonder is the beginning of the journey and questions are what makes the trip interesting. An active imagination that wonders and keeps asking questions is a great antidote for boredom.