In John 7:38-39 Jesus said, "He that believed on me, as the Scripture hath said, out of his belly shall flow rivers of living water. (But this spake he of the Spirit, which they that believe on him should receive.)" The fullness of the indwelling Holy Spirit is the main reason for this "running over cup" experience.
Men, as fathers it is important that we who claim to have the Holy Spirit dwelling in us, should be manifesting this overflowing cup experience, especially for the sake of our wives and children. It is only when our cup is overflowing that others will be blessed. It is not good that we retain the blessings of God to ourselves.
Our Heavenly Father has not kept the blessings of His kingdom to Himself but gives over and over again, despite all our unworthiness. We often sing Annie Johnson Flint's hymn...
His love has no limits, His grace has no measure,
His power no boundary known unto men;
For out of His infinite riches in Jesus
He giveth, and giveth, and giveth again.
Fathers, we must also set this same example of overflowing goodness so that our children will follow in our steps.
Be encouraged.
Colin Campbell