master key
Noun
Meaning
key that secures entrance everywhere
Source: WordNetSynonyms
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Examples
Love is the master key that opens the gates of happiness.
The balance you have between drive and patience may be your master key to success.
Spirituality is indeed the master key of the Indian mind; the sense of the infinite is native to it.
... one can still say that quantum mechanics is the key to understanding magnetism. When one enters the first room with this key there are unexpected rooms beyond, but it is always the master key that unlocks each door.
The master key of knowledge is, indeed, a persistent and frequent questioning.
Spirituality is the master key of the Indian mind.