Friendship

"...nothing delights the mind so much as fond and loyal friendship. What a blessing it is to have hearts that are ready and willing to receive all your secrets in safety, with whom you are less afraid to share knowledge of something than keep it to yourself, whose conversation soothes your distress, whose advice helps you make up your mind, whose cheerfulness dissolves your sorrow, whose very appearance cheers you up!"

Source: On the Shortness of Life by Seneca