When a person is undisturbed even in the presence of various causes of disturbance, he is called reserved and perseverant. An example of this perseverance and reservation is found in the behavior of King Parīkṣit, as described in the First Canto, Nineteenth Chapter, verse 15, of Śrīmad-Bhāgavatam. The King says there to all the sages present before him at the time of his death, "My dear brāhmaṇas, you should always accept me as your surrendered servant. I have come to the bank of the Ganges just to devote my heart and soul unto the lotus feet of Lord Kṛṣṇa. So please bless me, that mother Ganges may also be pleased with me. Let the curse of the brāhmaṇa's son fall upon me—I do not mind. I only request that at the last moment of my life all of you will kindly chant the holy name of Viṣṇu, so that I may realize His transcendental qualities."
This example of Mahārāja Parīkṣit's behavior, his remaining patient even at the last point of his life, his undisturbed condition of mind, is an example of reservation. This is one of the characteristics of a devotee who has developed ecstatic love for Kṛṣṇa.