There are many locks in my house and all with different keys, but I have one master key which opens them all.
So the Lord has many treasuries and secrets all shut up from carnal minds with locks which they cannot open; but he who walks in fellowship with Jesus possesses the master key, which will admit him to all the blessings of the covenant; yea, to the very heart of God.
Through the Well-Beloved we have access to God, to Heaven, to every secret of the Lord.—SPURGEON.