If we do not reach enlightenment we will be reincarnated/reborn in to this realm of existance again.
Buddha teached the path out of suffering, but we must enlighten to it our self, no free ticket to Nirvana
the law of karma ( reaction to action done in past or present moment) will tell if we have high enough virtue, morality and wisdom to reach enlightenment (one part of the enlightenment)
But if we keep doing wrong doings or have wrong view, wrong speech and wrong action, then we can not reach the wisdom.
in buddhism the way out of reincarntion cycle is to understand the 4 noble truth of suffering, and the path out is the 8 folded path
1. Suffering
Life always involves suffering, in obvious and subtle forms. Even when things seem good, we always feel an undercurrent of anxiety and uncertainty inside.
2. The Cause of Suffering
The cause of suffering is craving and fundamental ignorance. We suffer because of our mistaken belief that we are a separate, independent, solid “I.” The painful and futile struggle to maintain this delusion of ego is known as samsara, or cyclic existence.
3. The End of Suffering
The good news is that our obscurations are temporary. They are like passing clouds that obscure the sun of our enlightened nature, which is always present. Therefore, suffering can end because our obscurations can be purified and awakened mind is always available to us.
4. The Path
By living ethically, practicing meditation, and developing wisdom, we can take exactly the same journey to enlightenment and freedom from suffering that the buddhas do. We too can wake up.
and 8 folded path
- Right understanding: Understanding that the Four Noble Truths are noble and true.
- Right thought: Determining and resolving to practice Buddhist faith.
- Right speech: Avoiding slander, gossip, lying, and all forms of untrue and abusive speech.
- Right conduct: Adhering to the idea of nonviolence (ahimsa), as well as refraining from any form of stealing or sexual impropriety.
- Right means of making a living: Not slaughtering animals or working at jobs that force you to violate others.
- Right mental attitude or effort: Avoiding negative thoughts and emotions, such as anger and jealousy.
- Right mindfulness: Having a clear sense of one’s mental state and bodily health and feelings.
- Right concentration: Using meditation to reach the highest level of enlightenment.