So that is the reason we should always generate goodness in our thoughts, in our deeds. In thoughts, deeds, and what else? Speech, yes, to derive the goodness that we have sown. That is why in the Bible it is stated, "As you sow, so shall you reap," and in the Buddhist scriptures, it is stated that if you do good deeds, you'll get good results; if you do bad, then you'll reap the results thereof. Most scriptures mention the same things. In order to reach heaven, it is logical, now we know that we have to tune into goodness, to the positive part of the world. And the more we step into goodness, the nearer the goodness, the more we merge into this heavenly quality and the more we are near to heaven. The negative force may exist in our neighborhood, but it will not affect us. For example, we have lights in our house, neon lamps, and outside our house may be darkness, but when we step into our house and stay there, we can read, we can work, we can play, we can see our loved ones and all the surroundings. The darkness outside will not affect our light inside the house. So that is a very simple and a kind of basic explanation about good and evil, heaven and hell.
(Also see: Along the Path - Cultivating thoughts, speech and actions.)