Al-Hasan al-Basree (Rahimahullaah) said, "The believer is like a prisoner in this lowly world, who tries to free himself from its shackles and chains, never feeling secure in it, until the day he meets his Lord." [az-Zuhd by Ibn al-Mubaarak]
The best acts are doing what Allah has commanded, staying far away from what Allah has forbidden, and having sincere intentions for whatever Allah has required for us