I think what in the end is the only humanly achievable objective that gives meaning to life is what is portrayed in all the great religions as our final objective: the joy of fulfillment of all your needs in heavenly peace.

And the key to overcoming the human weaknesses in the way of obtaining that condition is love - not self love, not the selfish craving of ownership of our beloved ones or our possessions that is confused with true love either, but what the Greeks called 'agape' - an unconditional appreciation of everyone for what they are and of everything for what it is.