Literature Reference: 来日方长，未来可期。—— 《增广贤文》 The days ahead are long, and the future is promising. Source from 'Zengguang Xianwen'.
来: In the future, to and fro. Often used as a filler word in poetry and lyrics; the future, what is yet to come, tracing back to its origins.
Meaning: The days ahead are long, filled with hope and possibilities.