A person cannot commit suicide if his mind is pure and tranquil. If one leaves this world with a confused and frustrated mind, it is most unlikely that he would be born again in a better condition. Suicide is an unwholesome or unskillful act since it is encouraged by a mind filled with greed, hatred and delusion. Those who commit suicide have not learnt how to face their problems, how to face the facts of life, and how to use their mind in a proper manner. Such people have not been able to understand the nature of life and worldly conditions.
Some people sacrifice their own lives for what they deem as a good and noble cause.
Such actions may be classified as brave and courageous. However, from the Buddhist point of view, such acts are not to be condoned. The Buddha has clearly pointed out that the suicidal states of mind lead to further suffering.