"Those who believe in God because their experience of life and the facts of nature prove his existence must have led sheltered lives and closed their hearts to the voice of their brothers' blood"

Walter Kaufmann's quote presents a crucial perspective on the relationship in between belief in God and one's experiences and perceptions of the world. By suggesting that those who find proof of God's existence in their life experiences and natural observations have "led protected lives", Kaufmann indicates that such people may not have been completely exposed to the severe realities and varied experiences that can lead one to question the presence of a kindhearted divine being.

The phrase "the truths of nature" usually describes the natural world's order, beauty, and complexity, typically mentioned by theists as evidence of divine development. However, Kaufmann challenges this view by implying that a focus exclusively on these positive elements ignores the similarly significant existence of chaos, suffering, and apparent randomness worldwide, which can oppose the notion of a kind and omnipotent deity.

Additionally, Kaufmann's reference of "the voice of their bros' blood" stimulates an effective and visceral image of human suffering and injustice. This expression most likely objectives to remind readers of the profound ethical and existential questions that occur from experiencing or experiencing suffering, violence, and betrayal, typically leading individuals to question or reject a simple belief in a benevolent God.

Kaufmann recommends that those who quickly reconcile their faith with their experiences may be closing their hearts to these deeper questions and the suffering of others. His critique appears ingrained in a require a more nuanced and maybe more doubtful engagement with faith-- a faith that does not ignore or gloss over the darker aspects of human experience.

Ultimately, Kaufmann challenges believers to think about the full spectrum of human experience. He suggests that to truly come to grips with the intricacies of faith, one must stay open to question, engage with the world's suffering, and acknowledge contradictions, instead of relying solely on individual or naturalistic affirmations of magnificent existence.