Should a frog croak out a compliment to a toad?

(The following is an excerpt from a letter of John Berridge to a fellow minister who recently had a bad fall.)

Dear Sir,
I received your letter, and dare not say that I am sorry for your fall, nor indeed for any afflictions that God lays on His children; they are tokens of His fatherly love, and needful medicine for us. Rather would I pray that while God keeps you in the furnace-you may be still, and feel your dross and tin being purged away.

The Lord Jesus gives me a dose of this medicine most days; and I am never so well as when I am taking it, though I frequently make a crooked face at it. If your heart is as my heart, it will need many a bitter potion to cleanse and strengthen it! Afflictions have been to me some of my greatest mercies.

No lasting gain do I get, but in a furnace. Comforts of every kind make me either light or lofty, and swell me, though unperceivably, with self-sufficiency. Indeed, so much dross, native and acquired, is found in my heart, that I have constant need of a furnace. Jesus has selected a suitable furnace for me, not a hot and hasty one, which seems likely to harden and consume me-but one with a gentle and lingering heat, which melts my heart gradually, and lets out some of its dross. Though I cannot love the furnace, yet the longer I live, the more I see of its need and its use. A believer seldom walks steadily and brightly, unless he is well-furnaced.

"I have refined you, but not as silver is refined. Rather, I have refined you in the furnace of affliction!" Isaiah 48:10

Why do you write to me with so much reverence? Is this befitting language from one sinner to another sinner? Ought the dust of the earth to elevate his kindred ashes? Should a frog croak out a compliment to a toad?

May the Lord water your soul and your vineyard, and teach you to know nothing, and preach nothing but Jesus Christ!

For His sake, I am your servant,
John Berridge, 1761