All is not lost, the unconquerable will, and study of revenge, immortal hate, and the courage never to submit or yield. - John Milton

Solitude sometimes is best society.

The happy place
Imparts to thee no happiness, no joy — Rather inflames thy torment, representing
Lost bliss, to thee no more communicable;
So never more in Hell than when in Heaven.

He who thinks we are to pitch our tent here, and have attained the utmost prospect of reformation that the mortal glass wherein we contemplate can show us, till we come to beatific vision, that man by this very opinion declares that he is yet far short of truth.