“… one can't avoid the storms and calamities of life, but one can at least find the right partner to face them with.”

Book XLII: Ch. 18: A summary of the changes which have occurred around the globe in my lifetime
Mémoires d'outre-tombe (1848 – 1850)
Context: New storms will arise; one can believe in calamities to come which will surpass the afflictions we have been overwhelmed by in the past; already, men are thinking of bandaging their old wounds to return to the battlefield. However, I do not expect an imminent outbreak of war: nations and kings are equally weary; unforeseen catastrophe will not yet fall on France: what follows me will only be the effect of general transformation. No doubt there will be painful moments: the face of the world cannot change without suffering. But, once again, there will be no separate revolutions; simply the great revolution approaching its end. The scenes of tomorrow no longer concern me; they call for other artists: your turn, gentlemen!
As I write these last words, my window, which looks west over the gardens of the Foreign Mission, is open: it is six in the morning; I can see the pale and swollen moon; it is sinking over the spire of the Invalides, scarcely touched by the first golden glow from the East; one might say that the old world was ending, and the new beginning. I behold the light of a dawn whose sunrise I shall never see. It only remains for me to sit down at the edge of my grave; then I shall descend boldly, crucifix in hand, into eternity.

page 9
The Other Wife (2003)

Source: The Unbearable Lightness of Being

Source: The First Phone Call from Heaven

Source: Life, the Universe and Everything

Hercules Furens (The Madness of Hercules), lines 325-328; (Megara).
Tragedies

Source: The Terror

As quoted in Honor Your Gifts (2007) by Dona M. Deane, p. 199.
Variant: But there is suffering in life, and there are defeats. No one can avoid them. But it's better to lose some of the battles in the struggles for your dreams than to be defeated without ever knowing what you're fighting for