Heaven and hell
Heaven and hell are Christian concepts. (As is Satan.) The Celtic Otherworld is a place of rest between lives.
Death is not the end
Life and death are part of the great cycle and are inevitable. Death is not the end. After death we go to a place of rest in the Otherworld. There we rest and recuperate and have a chance to assess our deeds in the life we have just lived.
Individual responsibility
Bad things in this life are not punishment for deeds in past lives.
Some people, including a few Neopagans, believe bad things happen to you in this life as a result of bad things you did in a past life, and that any and every wrong committed against a person in this life, no matter what it is, is punishment for wrongdoing in a previous life.
If the punishment theory is followed to its logical conclusion, it means molested children are to blame for being molested, murdered people are to blame for being murdered, and so on, and that is simply not true. Feelings of self-blame a victim may have are part of the crime not part of the victim.
Free will and the responsibility of the individual for their own salvation are key concepts in Neopaganism.
This means the victim is not the cause of the bad deed, rather the perpetrator is the cause by choosing to commit it. However, rather than being able to come back again and again to bring more grief into the world, an individual who does too many bad deeds brings about their own destruction and is extinguished forever.
In keeping with the individual's responsibility for their own salvation, our reincarnations are chances for us to get it right and live better, more enlightened lives. A person who chooses to use their current life or any other to cause distress to others is working towards their own damnation. Pity them and walk away from them. Your purpose is to save yourself. Forcing salvation on others is not the Neopagan way.
Time
Time is spiral. That is, it is not linear or cyclical but both. It both progresses and repeats. The cycles of the seasons, of life and death, of planting and reaping, of death and re-birth, of doing and learning, are endlessly repeated. And what we learn as individuals and as communities takes us forward. Thus time is not cyclical, not linear but both: spiral.
Someone else has expressed all this better than I can at Modern Paganism: Questions & Answers
