Killin' Time by Cat Stevens explores themes of existential reflection and the passage of time. Stevens adopts a contemplative tone, addressing the futility and fleeting nature of life. The song features moments of deep introspection, questioning the purpose behind everyday actions and routines. Key themes include the search for meaning, the inevitability of change, and the personal journey towards self-awareness. Poignant moments are found in the lyrics that reflect on lost opportunities and the transient nature of human existence.