Charles H. Spurgeon on Psalms 94:12

Blessed is the man whom thou chastenest, O LORD. The psalmist's mind is growing quiet. He no longer complains to God or argues with men, but tunes his harp to softer melodies, for his faith perceives that with the most afflicted believer all is well. Though he may not feel blessed while smarting under the rod of chastisement, yet blessed he is; he is precious in God's sight, or the Lord would not take the trouble to correct him, and right happy will the results of his correction be. The psalmist calls the chastened one a "man" in the best sense, using the Hebrew word which implies strength. He is a man, indeed, who is under the teaching and training of the Lord. And teachest him out of thy law. The book and the rod, the law and the chastening, go together, and are made doubly useful by being found in connection. Affliction without the word is a furnace for the metal, but there is no flux to aid the purifying: the word of God supplies that need, and makes the fiery trial effectual. After all, the blessing of God belongs far rather to those who suffer under the divine hand than to those who make others suffer: better far to lie and cry out as a "man" under the hand of our heavenly Father, than to roar and rave as a brute, and to bring down upon one's self a death blow from the destroyer of evil. The afflicted believer is under tuition, he is in training for something higher and better, and all that he meets with is working out his highest good, therefore is he a blessed man, however much his outward circumstances may argue the reverse.