It is important to have a positive mental attitude because your attitude affects your actions, and your actions affect your final results. So, your attitude affects your results.
Attitude > Actions > Results.
Experience tells us that negative attitudes tend to produce negative results
Positive attitudes tend to create positive results.
If you want better results, then one way to get them, is to create and sustain a positive mental attitude. That is why positive attitude is important.
You will discover how to create and sustain a positive mental attitude on this course.