Strength of mind is the ability to remain peaceful and positive in the face of adversity, which is an inevitable part of life and a capacity that can be developed. Buddhism teaches that unhappiness is not caused by external situations or other people, but by inner mental tendencies—especially attachment to the fulfilment of our own wishes—and recognizing this shifts us from blame which makes us weak to wisdom and resilience. Based on the book How to Solve our Human Problems by Geshe Kelsang Gyatso