Question: How can you keep your aspiration high when you get tired?

Sri Chinmoy: When you get tired, try to sing inwardly and soulfully, especially the Invocation. Then, while you are singing, feel that God Himself is listening to your soulful song and appreciating you. In this way you can easily keep your aspiration high even though outwardly you are tired and exhausted.
Sri Chinmoy, Aspiration-Tree, Aum Publications, 1976