The following is from Spurgeon's sermon,
"Things Present" #870. 1 Corinthians 3:22.

Tribulations are treasures; and if
we were wise, we would reckon our
afflictions among our rarest jewels.

The caverns of sorrow are mines of diamonds!

Our earthly possessions may be silver, but
trials are, to the saints, invariably gold.

We may grow in grace through what we enjoy,
but we probably make the greatest progress
through what we suffer.

'Soft gales' may be pleasant for heaven bound
vessels, but 'rough winds' are better. The 'calm'
is our way, but God has his way in the whirlwind,
and he rides on the wings of the wind.

Saints gain more by their losses than by their profits.

Spiritual health comes out of their sicknesses;
and spiritual wealth flows out of their poverties.

Heir of heaven, your present trials are your
medicine. You need that your soul, like your
body, should be dealt with by the beloved
Physician.  He can heal without the lancet if
he desires, but he does not choose to do so,
but will use the means of affliction.  In all
his potion there is not one 'chance' atom;
the medicine has been compounded by no
ordinary skill;  the infinite wisdom which
balanced the clouds, and fixed the corner
stone of the world, has been employed to
compound the ingredients of your present trial.

Your affliction shall not be too much for you,
 it shall be just such a trial as you require.

Weep not because your sun has gone done,
for it descends that the dews may be brought
forth and the earth may be watered, and the
flowers may drip with perfume. Wait  awhile,
and the sun shall come back to you again,
and the morn shall be the brighter because
of the gloom of the night.

O sorrow not, heir of heaven, because the
skies are clouded; the clouds are big with
mercy; and each cloud is the mother of ten
thousand blossoms, and harvests are
concealed in yonder darkness!

O be confident that among all your jewels,
all your precious ornaments and tokens of
love that God has given you, you have nothing
brighter than the black jewels of affliction,
no diamonds of a finer water than those of
trouble.

May we understand by faith, then, the great
truth that our present trials are our treasures,
to be looked upon with thankfulness.

Be thankful, therefore, for your trials,
and count them among your treasures!