He who ascends to mountain-tops, shall find
The loftiest peaks most wrapt in clouds and snow;
He who surpasses or subdues mankind
Must look down on the hate of those below.

George Gordon, Lord Byron (1788-1824) English poet

Childe Harold’s Pilgrimage, Canto 3, st. 45 (1816)
    (Source)

In manuscript form, the last line is "Must look down on the hate of all below."