Chan Master Sheng Yen: According to the Buddhist teaching of cause and effect, since one has not realised the truth of all phenomena, or is not liberated from life and death, suicide is pointless. When one’s karmic retribution is not exhausted, death by suicide only leads to another cycle of rebirth. This is why Buddhists do not support suicide, and instead, encourage constructive living, using this life to diligently practise good, thus changing the present and the future for the better.
His Holiness the 14th Dalai Lama: Some people commit suicide; they seem to think that there is suffering simply because there is the human life, and that by cutting off the life there will be nothing… But, according to the Buddhist viewpoint, that’s not the case; your consciousness will continue. Even if you take your own life, this life, you will have to take another body that again will be the basis of suffering. If you really want to get rid of all your suffering, all the difficulties you experience in your life, you have to get rid of the fundamental cause (greed, hatred and delusion) that gives rise to the aggregates that are the basis of all suffering. Killing yourself isn’t going to solve your problem.
Ven. K. Sri Dhammananda: Taking one’s own life under any circumstances is morally and spiritually wrong. Taking one’s own life owing to frustration or disappointment only causes greater suffering. Suicide is a cowardly way to end one’s problems of life. 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.
Ven. S. Dhammika, Good Question Good Answer, 2008, p26: When one person murders another they might do it out of fear, anger, fury, greed or some other negative emotions. When a person kills himself or herself they might do it for very similar reasons or because of other negative emotions like despair or frustration. So whereas murder is the result of negative emotions directed towards another, suicide is the result of negative emotions directed towards oneself, and therefore would be breaking the Precept. However, someone who is contemplating suicide or has attempted suicide does not need to be told that what they are doing is wrong. They need our support and our understanding. We have to help them understand that killing themselves is perpetuating their problem, surrendering to it, not solving it.