From Longman Dictionary of Contemporary Englishleap of faithleap of faithsomething you do even though it involves a risk, hoping that it will have a good result → leap
Examples from the Corpus
leap of faith• For this the Middle East needs a leap of faith.• These reforms, untested by pilot evaluations, represent a leap of faith.• If not, some franchise will have to take a leap of faith.• The change is also so unprecedented that it necessitates a genuine leap of faith.• It encompasses both the art of spin doctoring and also our fragile human need and ability to make huge leaps of faith.• For my taste, there are a few too many leaps of faith required.• It would take only a minor leap of faith, a moment of transcendence, to believe that Christine Ashdown stared back.• Privatization would be an untested leap of faith. 