(Because) the notion of ...

(Because) the notion of absolute truth is difficult to sustain outside the context of religion, ethical conduct is not something we engage in because it is somehow right in itself but because, like ourselves, all others desire to be happy and to avoid suffering. Given that this is a natural disposition, shared by all, it follows that each individual has a right to pursue this goal. Accordingly, I suggest that one of the things which determines whether an act is ethical or not is its effect on others\' experience or expectation of happiness.
(Because) the notion of absolute truth is difficult to sustain outside the context of religion, ethical conduct is not something we engage in because it is somehow right in itself but because, like ourselves, all others desire to be happy and to avoid suffering. Given that this is a natural disposition, shared by all, it follows that each individual has a right to pursue this goal. Accordingly, I suggest that one of the things which determines whether an act is ethical or not is its effect on others' experience or expectation of happiness.
 Dalai Lama

Quotes from the same author

Material objects give rise to physical happiness, while spiritual development gives rise to mental happiness. Since we experience both physical and mental happiness, we need both material and spiritual development. This is why, for our own good and that of society we need to balance material progress with inner development.
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 Dalai Lama
With the realization of one's own potential and self-confidence in one's ability, one can build a better world.
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 Dalai Lama
It is difficult to achieve a spirit of genuine cooperation as long as people remain indifferent to the feelings and happiness of others.
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 Dalai Lama
There is no need for temples, no need for complicated philosophies. My brain and my heart are my temples; my philosophy is kindness.
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 Dalai Lama
I believe that we are fundamentally the same and have the same basic potential.
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 Dalai Lama