What is the difference between positive attitude and gullible?

Viewing events and situations in a positive light is important. The strength, wisdom and cheerfulness that accompany such an attitude lead to happiness. To regard everything in a positive light or with a spirit of goodwill, however, does not mean being foolishly gullible and allowing people to take advantage of our good nature. It means having the wisdom and perception to actually move things in a positive direction by seeing things in their best light, while all the time keeping our eyes firmly focused on reality.

For Today and Tomorrow
Daily Encouragement by Daisaku Ikeda 28/1

Our attitude of how we approach life

Depending on their outlook, people's old age will dramatically differ, especially in terms of the richness and fulfillment they will experience. Everything is up to our attitude, how we approach life. Do we look at old age as a descending path to oblivion? Or is it a period in which we can attain our goals and bring our lives to a rewarding, satisfying completion? 14/3