What the Buddha Taught, p46-47[Among the three essentials – Ethical Conduct (Sila), Mental Discipline (Samādhi) and Wisdom (Paññā)] Ethical Conduct (Sīla), based on love and compassion, includes three factors of the Noble Eightfold Path: namely, Right Speech, Right Action and Right Livelihood. (Nos. 3, 4 and 5 in the list).
Right speech means abstention (1) from telling lies, (2) from backbiting and slander and talk that may bring about hatred, enmity, disunity and disharmony among individuals or groups of people, (3) from harsh, rude, impolite, malicious and abusive language, and (4) from idle, useless and foolish babble and gossip. When one abstains from these forms of wrong and harmful speech one naturally has to speak the truth, has to use words that are friendly and benevolent, pleasant and gentle, meaningful and useful. One should not speak carelessly: speech should be at the right time and place. If one cannot say something useful, one should keep ‘noble silence.’
Right Action aims at promoting moral, honorable and peaceful conduct. It admonishes us that we should abstain from destroying life, from stealing, from dishonest dealings, from illegitimate sexual intercourse, and that we should also help others to lead a peaceful and honorable life in the right way.
Right Livelihood means that one should abstain from making one’s living through a profession that brings harm to others, such as trading in arms and lethal weapons, intoxicating drinks, poisons, killing animals, cheating, etc., and should live by a profession which is honorable, blameless and innocent of harm to others. One can clearly see here that Buddhism is strongly opposed to any kind of war, when it lays down that trade in arms and lethal weapons is an evil and unjust means of livelihood.
These three factors (Right Speech, Right Action and Right Livelihood) of the Eightfold Path constitute Ethical Conduct. It should be realized that the Buddhist ethical and moral conduct aims at promoting a happy and harmonious life both for the individual and for society. This moral conduct is considered as the indispensable foundation for all higher spiritual attainments. No spiritual development is possible without this moral basis.