Charles H. Spurgeon on Psalms 104:21

The young lions roar after their prey, and seek their meat from God. This is the poetic interpretation of a roar. To whom do the lions roar? Certainly not to their prey, for the terrible sound tends to alarm their victims, and drive them away. They after their own fashion express their desires for food, and the expression of desire is a kind of prayer. Out of this fact comes the devout thought of the wild beast's appealing to its Maker for food. But neither with lions nor men will the seeking of prayer suffice, there must be practical seeking too, and the lions are well aware of it. What they have in their own language asked for they go forth to seek; being in this thing far wiser than many men who offer formal prayers not half so earnest as those of the young lions, and then neglect the means in the use of which the object of their petitions might be gained. The lions roar and seek; too many are liars before God, and roar but never seek. How comforting is the thought that the Spirit translates the voice of a lion, and finds it to be a seeking of meat from God! May we not hope that our poor broken cries and groans, which in our sorrow we have called "the voice of our roaring" Ps 12:10, will be understood by him, and interpreted in our favour. Evidently he considers the meaning rather than the music of the utterance and puts the best construction upon it.