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. When the speaker wishes the heart to remain 'fresh', what is the intended meaning?

1. Taking a bath regularly
2. Keeping an active, lively and positive spirit
3. Remaining elegantly dressed
4. Having only new ideas all the time