How does one develop a good attitude? The same way one develops anything else, PRACTICE.
Numbers 13:30-33 (NLT)
30 But Caleb tried to quiet the people as they stood before Moses. “Let’s go at once to take the land,” he said. “We can certainly conquer it!”
31 But the other men who had explored the land with him disagreed. “We can’t go up against them! They are stronger than we are!”
32 So they spread this bad report about the land among the Israelites: “The land we traveled through and explored will devour anyone who goes to live there. All the people we saw were huge.
33 We even saw giants[ there, the descendants of Anak. Next to them we felt like grasshoppers, and that’s what they thought, too!”
Numbers 14:23-25 (NLT)
23They will never even see the land I swore to give their ancestors. None of those who have treated me with contempt will ever see it.
24 But my servant Caleb has a different attitude than the others have. He has remained loyal to me, so I will bring him into the land he explored. His descendants will possess their full share of that land.
25Now turn around, and don’t go on toward the land where the Amalekites and Canaanites live. Tomorrow you must set out for the
"I have told you these things, so that in me you may have peace. In this world you will have trouble. But take heart! I have overcome the world."
Philippians 4:8-9 (NLT)
8 And now, dear brothers and sisters, one final thing. Fix your thoughts on what is true, and honorable, and right, and pure, and lovely, and admirable. Think about things that are excellent and worthy of praise. 9 Keep putting into practice all you learned and received from me—everything you heard from me and saw me doing. Then the God of peace will be with you.
You can alter your life by altering your attitude!