What is the solution that each of these ideas reaches after? I believe it is ultimately the fulfillment of each individual. At the end of the day, if I can say I moved towards my meaning of life, and provided further reason for my continued existence, then I can look past all the bad that I have done, pat myself on the back, and try to do the same thing tomorrow. The only thing this really accomplishes is to release endorphins and make me happy. If all I try to do is realize my potential and dreams, I am solely working for me, making sure my priorities are above everyone else's. If all I try to do is achieve biological perfection, and try to make the next generation better, I know that everyone after me has me to thank for their great lives.
We can easily see that all of this is, in the end, amazingly self-centered. Everything we do, we do to get ourselves something. The problem is that we are inherently finite beings. We cannot know everything, do everything, see everything, feel everything, touch everything, or even live long enough to give ourselves the chance to try. Following any of Wikipedia's answers leads to ultimate failure.
What is the Christian's answer? What is the meaning of our lives?
I have seen the business that God has given to the children of man to be busy with. He has made everything beautiful in its time. Also, he has put eternity into man's heart, yet so that he cannot find out what God has done from the beginning to the end. I perceived that there is nothing better for them than to be joyful and to do good as long as they live; also that everyone should eat and drink and take pleasure in all his toil—this is God's gift to man. - Ecclesiastes 3:10-13Our meaning in life, the point of our existence is to be joyful and do good. Doing these two things puts us in direct contrast with the world. Being joyful does nothing to make people cater to your needs. Doing good and serving oneself cannot both be done. If a Christian does not do these things, he puts his meaning of life in something else, something other than what he is called to.
Author Stephen Covey in his book 7 Habits of Highly Effective People writes that an effective person should begin with the end in mind. Basically, one should envision one's eulogy being read. What goes into it should determine what we do with our lives. If the Christian was to begin with the end in mind, he would center his life on being joyful and doing good. This is the only way to do what God has called us to do, and it also puts on a totally opposite path from the rest of the world.