“A mountain was in labour, sending forth dreadful groans, and there was in the region the highest expectation. After all, it brought forth a mouse.”

Source: Ars Poetica, or The Epistle to the Pisones (c. 18 BC), Line 139. Horace is hereby poking fun at heroic labours producing meager results; his line is also an allusion to one of Æsop's fables, The Mountain in Labour. The title to Shakespeare's play Much Ado About Nothing expresses a similar sentiment.

Life of Agesilaus II
Bartlett's Familiar Quotations, 10th ed. (1919)

This is how the spirit comes. After the gale, the earthquake, and fire: a gentle, cooling breeze. This is how it will come in our own day as well. We are passing through the period of earthquake, the fire is approaching, and eventually (when? after how many generations?) the gentle, cool breeze will blow.
"The Desert. Sinai.", Ch. 21, p. 278
Report to Greco (1965)

Canto I, Stanza 72.
The Castle of Indolence (1748)

Protocols to the Experiments on Hashish, Opium and Mescaline http://www.wbenjamin.org/protocol1.html (1927-1934, English translation 1997)

Source: Kavanagh: A Tale (1849), Chapter 13.
Context: Ah, how wonderful is the advent of spring! — the great annual miracle of the blossoming of Aaron's rod, repeated on myriads and myriads of branches! — the gentle progression and growth of herbs, flowers, trees, — gentle and yet irrepressible, — which no force can stay, no violence restrain, like love, that wins its way and cannot be withstood by any human power, because itself is divine power. If spring came but once in a century, instead of once a year, or burst forth with the sound of an earthquake, and not in silence, what wonder and expectation there would be in all hearts to behold the miraculous change! But now the silent succession suggests nothing but necessity. To most men only the cessation of the miracle would be miraculous and the perpetual exercise of God's power seems less wonderful than its withdrawal would be.

Spiritual Canticle of The Soul and The Bridegroom
Context: Let us rejoice, O my Beloved!
Let us go forth to see ourselves in Thy beauty,
To the mountain and the hill,
Where the pure water flows:
Let us enter into the heart of the thicket. ~ 36

Letter to Dionigi di Borgo San Sepolcro (26 April 1336), "The Ascent of Mount Ventoux" in Familiar Letters http://petrarch.petersadlon.com/read_letters.html?s=pet17.html as translated by James Harvey Robinson (1898); the name Mount Ventosum relates to it being a windy mountain.
Context: To-day I made the ascent of the highest mountain in this region, which is not improperly called Ventosum. My only motive was the wish to see what so great an elevation had to offer. I have had the expedition in mind for many years; for, as you know, I have lived in this region from infancy, having been cast here by that fate which determines the affairs of men. Consequently the mountain, which is visible from a great distance, was ever before my eyes, and I conceived the plan of some time doing what I have at last accomplished to-day.

Del terreno nel concavo seno
Vasto incendio se bolle ristretto,
A dispetto del carcere indegno,
Con più sdegno gran strada si fa.
Fugge allora; ma, intanto che fugge,
Crolla, abbatte, sovverte, distrugge
Piani, monti, foreste e città.
Act III, scene 3.
Achille in Sciro (1736)