Apre'  s le rare bonheur de trouver une compagne qui nous soit bien assortie, l'e¤  tat le moins malheureux de la vie est sans doute de vivre seul. After the rare happiness of finding a companion with whom we are well matched, the least unpleasant state of life is without doubt to live alone.

-Bernardin de Saint-Pierre,Jacques-Henri
  Paul et Virginie.

The ideal companion in bed is a good book.

-Davies, Robertson
Interviewed by Terence M Green, recorded in  J Madison Davis (ed) Conversations with Robertson Davies (1989).

I live in company with a body, a silent companion, exacting and eternal.He it iswho notesthat individuality whichistheseal oftheweakness ofourrace.Mysoul has wings, but the brutal jailer is strict.

-Delacroix, (Ferdinand Victor) Euge'  ne
  The Journal of Euge'  ne Delacroix (translated by W Pach, 1948), entry for 4  Jun.

Nay, good sir, be not so violent; with speed I cannot render satisfaction Unto the dear companion of my soul, Virginity, whom I thus long have lived with, And part with it so rude and suddenly. Can such friends divide, never to meet again, Without a solemn farewell?

-Middleton,Thomas
  The Changeling (with William Rowley), act1, sc.1.

I never found the companion that was so companionable as solitude.

-Thoreau, Henry David
  Walden, or Life in theWoods,'Solitude'.

Dieu cre¤  a l'homme, et ne le trouvant pas assez seul, il lui donne une compagne pour lui faire mieux sentir sa solitude. God created man and, finding him not sufficientlyalone, gave him a companion to make him feel his solitude more keenly.

-Vale¤  ry, Paul
Tel Quel1,'Moralite¤  s'.