What is it and how can we choose it?

about a glass

Can you define it?

to look on the favorable side of events and expect a more favorable outcome 

 impact how we feel and what we do

Recognize any of these?

I only have one close friend so I'm a loser

I failed a math test so I'm going to fail all tests

We blow a mistake out of proportion, such as I missed one line during the play so my performance was terrible 

I "should" have done better. He should have done this..

We need to take responsibility when it is ours 

Expecting disaster without proof

We need to be mindful of our thinking