Philosophy is the love of Wisdom. There is nothing wrong with this. However, we must understand the Scriptures where they say "The wisdom of man is foolishness in the eyes of God". I used to believe that the study of other religions and of the ancient philosophers would help me to better understand my own beliefs. However, after starting to study the Fathers of the Church, I have found that there is so much Wisdom recorded in the Tradition of the Church, that one could spend a lifetime just studying what has been translated into English. Never mind the volumes and volumes that have not. My view now is that every hour that I spend studying non-Orthodox philosophy is time missed that I could be gaining the Wisdom of God as put down by His Saints. Perhaps this is what the Apostle was trying to tell us. For a heathen, or in my case, a heretic, the study of philosophy and dogma brought me to the Church. Now that I am in the Church, the former tools are no longer needed. The Priest that brought me into the ROCOR put it to me this way:
"When you were in the jungle looking for the path, your machete was a useful, if not indispensable tool. However, once you have found the road that leads to salvation, the machete is no longer needed and other tools, such as a walking staff, may be of more use."
For me, the Philosophy of the Ancients and the writings of Lao Tsu, Plato, Luther and the like were my machete. Now, I find that I am more in need of the staff of the Fathers and the writings of Scripture and the Church. So, I do not believe that Philosophy is, in and of itself, wrong or evil. However, if the pursuit of "the wisdom of man" is impeding your acquisition of the Wisdom of God, then it becomes and evil that should be avoided. My vote goes to "Cautioned Against".