From Longman Dictionary of Contemporary Englishsense of proportionsense of proportionCOMPAREthe ability to judge what is most important in a situationhave/keep/lose a sense of proportionYou can protest by all means, but keep a sense of proportion. →proportion
Examples from the Corpus
have/keep/lose a sense of proportion• Experiment by all means - but keep a sense of proportion. 4.• You should, however, keep a sense of proportion.• At their best, lawyershave a sense of proportion and a sense of humor.• McCartney seems to have a good sense of proportion about his fame.• But let us keep a sense of proportion.