So many things in life, although they may seem very different, are actually the opposite sides of the same coin. Good and evil, love and hate, passion and obsession are so close to one another when we look at the causes behind each of them.
Buddhism teaches that our lives are endowed with both good and bad aspects simultaneously. The human mind switches between ten individual conditions, The Ten Worlds, and as we know, each World contains the other nine.
The lowest three Worlds are those of Hell, filled with suffering, Hunger, which is dominated by greed, and Animality, characterised by fear of the strong or powerful and contempt of the weak. The two highest worlds are those of Bodhisattva and Buddhahood, states of mind in which people strive to help others to eliminate their suffering and attain happiness.
Good and bad, happiness and sadness exist together, they cannot be separated and are integral parts of life. In fact it could be said that to try to describe one without the other would be meaningless.
Buddhist practice cannot remove bad things from our life nor the sadness, but it can help us deal with them (Poison into Medicine), and by doing so, help us and those around us promote the good and the happy aspects.
Nam Myoho Renge Kyo.