The Meaning of Life.
It's not about ME.
That's why I can't earn my way to Heaven by living a good life and doing good things. Christ Jesus, in grace and mercy, earned my way to Heaven through His sacrifice on the cross, paying my sin debt and that of all humanity. Living a good life and doing good things are a reflection of my faith in and obedience to Him.
That's the meaning of life, and without a relationship with God in Christ Jesus, life has no meaning.
If we are soulless beings whose existence ends when our bodies expire, then our attempts to live well-ordered, accomplished lives--let alone selfless lives dedicated to the service of others--are pointless, because even the most stellar advances are only temporary and the lives they touch, even improve, are only temporary. (And many "advancements" we believe to be improvements actually turn out to be as harmful as they are helpful, if not more so.)
Dedicating our lives to our own enjoyment and well-being is nothing but selfishness, and that never ends well. Dedicating our lives to others without the indwelling and guidance of God's love in the person of the Holy Spirit is nothing but hubris and serves a shallow, temporary good at best and often does as much or more harm.
The Meaning of LIfe?
It's not about me. It's about my relationship with HIM and how that affects all that I do and am.