Adapted poem context: A fountain keeps moving upward into sunshine, moonlight and starlight. It is bright, fresh and cheerful by day and night. The speaker admires its lively movement and wishes the heart could remain fresh, cheerful, constant and upward-looking like the fountain. What feeling is most strongly suggested by the fountain's constant movement?

1. Joy
2. Sadness
3. Earnestness
4. Weariness