Fortitude means facing danger or challenges with courage, strength and confidence. Believing in oneself allows a person to face challenges. It includes the ability to come to terms with problems, to accept them and to find a solution that is good for everyone.
One of the first lessons a Lakota child learned in the old days was self-control and self-restraint in the presence of parents or adults. Mastery and abilities came from games and creative play. Someone more skilled than oneself was viewed as a role model, not as a competitor. Striving was for achieving a personal goal, not for being superior to one's opponent. Success was a possession of the many, not of the few.
Fortitude may require patience, perseverance, and strength of mind in the face of challenges. It involves having confidence in oneself and the courage to continue even when all odds are against you. Fear still exists, but you proceed in spite of fear.