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This psalm is very strangely compounded. It is described in the title as the utterance of David when he fled from Saul and hid himself in the cave. It is the cry of a man beset with trouble and danger; yet all through it, we are startled by sudden transitions from cries for help and stories of wrong to cheerful expressions of hope and outbursts of praise. This condition of hopefulness and of cheerful steadfastness in the midst of trouble is one of those things which always puzzle a mere man of the world, but which present no mystery to a soul which walks with God. But the fact goes much farther than cheerfulness in trouble. The word "fixed" literally means "prepared," "fit," "ready." "O God, my heart is prepared." It is about this habitual preparation of heart that I wish to speak. The ideal perfect Christian life would be a life in contact with God along its whole line. It would be everywhere and always in communion with God. God's will and God's love would fill and move in every inlet and curve of the life, as the ocean in its gulfs and creeks and round its promontories; and upon this high plane the general tenor of the life would be more even. It hardly needs to be said that we do not live in this condition, and that we do need certain special influences to recall our minds to heavenly things, to lift them into the atmosphere of rest and of devotion, and to keep them from drifting away into worldliness and sensuality. God has recognized the need and has met it. He has given the Sabbath with its rest from labour, He has given the sanctuary with its quickening influences, He has commended the season of special prayer. We are led up to these Pisgahs and Hermons of spiritual vision, to the end that we may carry the power of these visions into life's common routine, to sanctify and to elevate that. These things are not an end unto themselves. The disciples were not permitted to stay on the Transfiguration Mount, but that glorious vision strengthened and kindled their hearts for the hard mission for which they were chosen. These exceptional experiences in our lives are intended to foster in us that constantly prepared, fixed heart of which David here sings: the heart that shall be prepared for praise, and for trust, and for worship, not only while sitting in heavenly places, but also among lions, among them that are set on fire, when the net has been prepared for the steps and the soul is bowed down, amid the fret and worry of life, and on the dead level of daily duty and care.

(Marvin R. Vincent, D. D)

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KJV: My heart is fixed, O God, my heart is fixed: I will sing and give praise.

WEB: My heart is steadfast, God, my heart is steadfast. I will sing, yes, I will sing praises.