CCC §68: By love, God has revealed himself and given himself to man. He has thus provided the definitive, superabundant answer to the questions that man asks himself about the meaning and purpose of his life.I think men go wrong in contemporary philosophy, insofar as we can call it that, when the premise of God is rejected, at least implicitly, in whole or part, from the outset. From what I have read of Sartre and Camus, the world sucks. One will tell me that 'Well yes, bad things happen, but when you either create your own meaning, or accept that life is absurd, a great burden is lifted, and you find freedom.'
There's a slight problem. Just a teensy-tiny one: The yoke is still there! People still have existential crises, because something shatters their constructed vision of reality. Also, how can everyone have their own reality that is true when each one is bound to contradict another at some point? I also think the philosophies of those two men were developed contextually, in response to the problems of the 20th century and their own lives.
Love. That word is conflated in modern culture. But, St Thomas Aquinas, the 13th-century theologian who shaped much of theology since then, defined love as "to love is to will the good of another." If we came back to that as the crux (yes, the cross, for the Crucifixion is the center-point of history) of daily life, then we would have true freedom.
Maybe my initial point is not clear enough. Of course, one will struggle if you ignore God. But, I am puzzled as to how the gift of reason, which allows you to know God without Scriptural revelation and before assent of faith [so far as I understand it], has been so maligned over the last century or so, to the point where the conclusions made through it have been completely torn away from Christ.