Thus a person should be prevented from co mmitting suicid e if possible, or from k illing another perso n. 2. No one may morally coerce or persuade another to act against his conscience. Thus, the government may not force someone to engage in military service if the person is convinced in conscience that all forms of physical combat are gravely sinful. This principle does not prohibit someone from trying to reason with others in order to make them change their judgement. No teaching of the Church can hope to account for every moral situation and circumstance.
Every teaching still has to be applied in particular cases.
One is not necessarily repudiating the values affirmed in the teaching if one decides that the teaching does not bind or apply in this matter. The teachings themselves are h istorically conditioned . What may have been perceived as morally wrong in one set of circumstances, e.g. charging interest on a loan today, in the context of modern commercial life. No individual or group of individuals can hope to identify and grasp moral truth by r elying entirely on their resources . We all need assistance.