Many Sikhs believe that Waheguru lives inside everyone like a
reflection in a mirror or fragrance within a flower. Through a long series of reincarnations, possibly through up to 8,400,000 forms of life, they will be purified and be able to return to Waheguru.
Each reincarnation as human or animal is temporary. Only humans can decide between right and wrong. For this reason, many Sikhs see their human life as the only time when the cycle of death and rebirth can be broken. The escape from the cycle of death and rebirth is known as mukti.
They also want to achieve a good rebirth to improve their chances of re-uniting with God. Most Sikhs believe God unites with those he is pleased with. When they have been united with Waheguru, the cycle of birth and death ends, suffering ends and the whole cycle is broken.
Those who meditate on God attain liberation. For them, the cycle of birth and death has been completed.Guru Granth Sahib page 11
Belief in life after death may be influenced by the meaning and purpose it lends to the lives of many Sikhs.