He asked her, "What hast thou in the house?" And she said, "Nothing but a pot of oil." But that pot of oil was adequate for all her wants, if she had only known how to use it.
In truth it represented the Holy Spirit, and the great lesson of the parable is that the Holy Ghost is adequate for all our wants, if we only know how to use Him.
All that she needed was to get sufficient vessels to hold the overflow, and then to pour out until all were filled.
And so the Holy Spirit is limited only by our capacity to receive Him, and when God wants us to have a larger fulness, He has to make room for it by creating greater needs.
God sends us new vessels to be filled with His Holy Spirit in the needs that come to us, and the trials that meet us. These are God's opportunities for God to give us more of Himself, and as we meet them He comes to us in larger fulness for each new necessity.
Lord, help me to see Thee in all my trying situations and to make them vessels to hold more of Thy grace.