A golden master-key!
 
(Charles Spurgeon)

"The Lord opened Lydia's heart to respond to what Paul was saying." Acts 16:14

God's saving grace will not be baffled.
 
He frequently begins with the silver key of a mother's tearful prayers and a father's tender counsels.
 
In turn, He uses the church-keys of His ordinances and His ministers, and these are often found to move the bolt.
 
But if they fail, He thrusts in the iron key of trouble and affliction which has been known to succeed after all others have failed.
 
He has, however, a golden master-key, which excels all others. It is the operation of His own most gracious Spirit, by which entrance is effected into hearts which seemed shut up forever.
 
Wonderful is the patience and long-suffering of the Lord, or He would long since have left hardened and careless sinners to themselves. He is importunate, whether we are so or not. We take pains to resist His heavenly grace, but He abides faithful to His own name of love.
 
O Lord, we bless You that You have opened our hearts, and we ask You now that You have entered, to abide in our souls forever, as a king in his own palace!