"How many men lack this power of 'holding on' until they reach the goal. They can make a sudden dash, but they lack grit. They are easily discouraged. They get on as long as everything goes smoothly, but when there is friction they lose heart. They depend on stronger personalities for their spirit and strength. They lack independence or originality. They only dare to do what others do. They do not step boldly from the crowd and act fearlessly."
........................Theodore Cuyler 

"The shores of fortune, are covered with the stranded wrecks of men of brilliant ability, but who lacked courage, faith, and decision, and have therefore perished in sight of more resolute but less capable
adventurers, who succeeded i making it to the port."
...................... Foster

"He who is silent is forgotten; he who does not advance falls back; he who stops is overwhelmed, distanced, crushed; he who ceases to become greater, becomes smaller; he who leaves off to live is to achieve, to will without ceasing."
............... anonymous