Understanding of mental fortitude and its influence

Each of us deals with hardships each day, placing mental barriers between ourselves and our goals. We all strive to push through these thoughts, as some of the Manifest Destiny explorers/adventurers/migrants did (think of the Oregon Trail type of expeditions). Please describe your understanding of mental fortitude and its influence on our daily lives, goals, long-term accomplishments, and more. In what ways do you practice “pushing forward” with your goals? Do you ever encounter obstacles, and if so, how do you respond?