The change in keys, typical in most symphonies, can relate to life. I have heard many works starting in a minor key, sounding sad or foreboding, and ending in a major key, sounding joyful or triumphant. Multiple changes are often heard throughout a piece.
Life can be like that. An attitude of gratitude can turn a hopeless feeling into a happy state of mind. That is my experience.
In a different sense of the words, focusing on minor tasks of little importance, should change to major accomplishments, as one matures and learns to prioritize. I am still working on that. However, it should be noted that small acts of service have major effects on the lives of others, especially when passed forward … with love.