Mused

He often mused about his future while doodling in his notebook.

She mused about her future career while gazing at the night sky.

She mused on her career choices as she contemplated her future.

He often mused about the fragility of life and the inevitability of death.

He mused over the possibility of quitting his job and traveling the world.

She often mused about the meaning of life and the purpose of human existence.