Philanthropy played a substantial role in Andrew Carnegie's life, significantly influencing his legacy. After amassing a fortune in the steel industry, Carnegie believed in the responsibility of the wealthy to give back to society, coining the phrase “the gospel of wealth.” He dedicated a large portion of his wealth to educational, cultural, and scientific institutions, establishing over 2,500 libraries and supporting causes like university education and the arts. Carnegie’s philanthropic efforts aimed to improve society and promote self-improvement. His influence extended beyond his lifetime, setting a precedent for modern philanthropy and the role of wealth in societal betterment.