Your body is mortal, but life principle (Atma) is imperishable. To attain immortality, have unconditional love for God. Imagine you going to a goldsmith and asking him to make a jewelry of your choice. Your job is only to entrust gold with him with the condition that the weight and design should be to your specification. You must not interfere in how he converts your gold into the jewellery you want. If you stipulate conditions that he should not burn it in fire, or beat it with a hammer, how can you get the ornament that you ordered? Similarly, if you surrender your heart to God with conditions and reservations, how can you attain bliss? What He does with you is His business. Pray to God with unconditional surrender. When all that you possess — your body, mind and intellect are His gifts, where is the need for you to lay conditions? Surrender completely, God will grant you the bliss you deserve!