A duty is a moral obligation that an agent has towards another person. Often duties have a corresponding right; but, certain duties do not have corresponding rights. These are duties that one must not do-no matter what. Thomas Aquinas argued that we have specific duties or obligations to avoid committing specific sins. Since sins such as theft are absolute, then our duty to avoid stealing is also absolute, irrespective of any good consequences that might arise from particular acts of theft. In the order of faith, Ten Commandments can be said to be absolute duties of a Christian.

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Positively certain that there is no error. Since reasons for human behavior pause number of reasons it is seldom reached in human behaviour. Circumstantial evidence should so cogent and compelling as to leave no ground for reasonable doubt but to lead to rational hypothesis. In absolute certainty, the person is convinced that there can be no possibility of error. A judge need not have reached absolute certainty in his decision-making, but only moral certainty. In moral certainty, there can be a possibility of error but there is no probability of error (see “moral certainty”).

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