do something to feel it is your duty to do

Preterit of shall, A statement of what should be the case as opposed to what is the case, verb_ auxiliary Be obliged to; have an obligation to; ought to; indicates that the subject of the sentence has some obligation to execute the sentence predicate, auxiliary Used to form the future tense of the subjunctive mood, usually in the first person, modern A variant of would

a necessary or essential thing, New wine; the unfermented juice as pressed from the grape, The quality or condition of being stale or musty, intransitive verb_ To be obliged or required by morality, law, or custom, Used to express a command or admonition, To be required or obliged to go, transitive verb_ To make musty, verb_ modal auxiliary, defective to do with certainty; indicates that the speaker is certain that the subject will have executed the predicate, modal auxiliary, defective to do as a requirement; indicates that the sentence subject is required as an imperative or directive to execute the sentence predicate, with failure to do so resulting in a negative consequence, adjective_ highly recommended

Bound or obliged in law or equity; responsible; answerable, at risk of or subject to experiencing something usually unpleasant, Exposed to a certain contingency or casualty, more or less probable; -- with to and an infinitive or noun