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I. THE FIXED HEART. For a fixed heart I must have a fixed determination, and not a mere fluctuating and soon broken intention. I must have a steadfast affection, and not merely a fluttering love, that, like some butterfly, lights now on this, now on that, sweet flower, but which has a flight straight as a carrier-pigeon to its cot, which shall bear me direct to God. And I must have a continuous realization of my dependence upon God, and of God's sweet sufficiency, going with me all through the dusty day. Is our average Christianity fairly represented by such words as these of my text? Do they not rather make us burn with shame when we think that a man who lived in the twilight of God's revelation, and was weighed upon by distresses such as wrung this psalm out of him, should have poured out this resolve which we, who live in the sunlight and are flooded with blessings, find it hard to echo, with sincerity and truth? Fixed hearts are rare amongst the Christians of this day.

II. THE MANIFOLD HINDRANCES THAT WE MEET TO SUCH A UNIFORMITY OF OUR RELIGIOUS LIFE. There is, for example, the tendency to fluctuation which besets all our feelings, and especially our religious emotions. What would happen to a steam-engine if the stoker now piled on coals and then fell asleep by the furnace door? One moment the boiler would be ready to burst; at another moment there would be no steam to drive anything. That is the sort of alternation that goes on amongst hosts of Christians to-day. Their springtime and summer are followed certainly by an autumn and a bitter winter. Every moment of elevation has a corresponding moment of depression. But is there any necessity for such alternations? Some degree of fluctuation there will always be. The very exercise of emotion tends to its extinction. Varying conditions of health and other externals will affect the buoyancy and clear-sightedness and vivacity of the spiritual life. Only a barometer that is out of order will always stand at set fair. The vane which never points but to south is rusty and means nothing. But while there cannot be absolute uniformity, there might and should be a far nearer approach to an equable temperature of a much higher range than the readings of most professing Christians give. There is, indeed, a dismally uniform arctic temperature in many of them. Their hearts are fixed, truly, but fixed on earth. Their frost, is broken by no thaw, their tepid formalism interrupted by no disturbing enthusiasm. We do not speak now of these, but of those who have moments of illumination, of communion, of submission of will, which fade all too soon. To such we would earnestly say that these moments may be prolonged and made more continuous. We need not be at the mercy of our own unregulated feelings. We can control our hearts, and keep them fixed, even if they should wish to wander.

III. THE MEANS BY WHICH SUCH A UNIFORM CHARACTER MAY BE IMPRESSED UPON OUR RELIGIOUS EXPERIENCE. A man climbing a hill, though he has to look to his feet, when in the slippery places, and all his energies are expended in hoisting himself upwards by every projection and crag, will do all the better if he lifts his eye to the summit that gleams above him. So we, in our upward course, shall make the best progress when we consciously and honestly try to look beyond the things seen and temporal, even whilst we are working in the midst, of them, and keep clear before us the summit to which our faith tends. If we lived in the endeavour to realize that great white throne, and Him that sits upon it, we should find it easier to say, "My heart is fixed, O God, my heart is fixed." But be sure of this, there will be no such uniformity of religious experience throughout our lives unless there be frequent times in them in which we go into our chambers and shut our doors about us, and hold communion with our Father in secret.

(A. Maclaren, 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.