What does it mean to have one's mind set on something?

 Mentally Fragile to Mentally STRONG! You have to listen to this!

to set your mind/have your mind set on sth

• to set the stage set the scene/stage for
• to set your face against sth
• to set your heart on something
• to set your mind/have your mind set on sth
• to set your teeth on edge
• to set/put sb's mind at rest
• to settle a score to settle an old score