The phrase "never ceasing" can be substituted with several synonyms, including constant, uninterrupted, perpetual, unremitting, incessant, and nonstop. These words all suggest a continuous and unending state. "Constant" indicates something that remains consistently present or occurring. "Uninterrupted" implies without any break or pause. "Perpetual" conveys the idea of something that lasts indefinitely. "Unremitting" stresses the continuous nature of an activity or process. "Incessant" suggests something that is unceasing and recurrent. "Nonstop" stresses the lack of any interruption or cessation. These synonyms can be used interchangeably to convey an idea of continuity and persistence.