noun
[noncount] the right to choose what should be done in a particular situation
Something that is done at your discretion is done if, how, when, etc., you choose to do it.
the quality of being careful about what you do and say so that people will not be embarrassed or offended :the quality of being discreet
discretion is the better part of valor
used to say that it is better to be careful than to do something that is dangerous and unnecessary;