wat should b done while facing life with a setback or a failure?

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how to overcome it? bcoz human mind is too quick nd delicate to handle,it spurs everytime here nd there so no matters if a person wnts to overcome it nd concentrate on a new job,bcoz it chases him everytime he sees his friend doing gud,where he faced a steback so wat to do? i dont think that psychological books will help in this matter