The first requisite for success is the ability to apply your physical and mental energies to one problem incessantly without growing weary.
— Thomas A. Edison

To live we must conquer incessantly, we must have the courage to be happy.
Henri Frederic Amiel incessant quote

Permanent success cannot be achieved except by incessant intellectual labour, always inspired by the ideal.
— Sarah Bernhardt

The longest absence is less perilous to love than the terrible trials of incessant proximity.
— Ouida

Medicine, the only profession that labors incessantly to destroy the reason for its own existance.
— incessant quotation by James Bryce