Shiki

“If you keep lamenting your misfortune, you will never be happy, since you see the world through misfortune-tinted glasses. Everything and everyone looks wrong to you. Those who live under 'normal' circumstances look far more fortunate than you are, and seemingly look down on you. These people who feel they are unfortunate reject others, unless they are regarded to have a similar fate. Some of these people are able to abandon this attitude as they realize they are not the only unfortunate people in the world. However some of them gather in groups, lament even further and thus drown more deeply into misfortune.”
― Hinowa Kouzuki, 妖怪アパートの幽雅な日常 8

“Cherish them always. Those times will never come back. Keep them in mind always. They may be only a small part of your days, but no amount of money can buy them back for you. Remember that not even the biggest power in the world has the ability to turn back time.”
― 深見真

“Cool down your head and think.
Just for a moment, forget your fanatism, anger, respect, everything.
Forget everything and ponder.
Use your own mind. Think carefully and make your own choice.”
― Kotaro Isaka, 魔王

“No matter how ridiculous it is, its good to express your emotions while you are young. If not, you end up reaching your limit. We accumulate small and trivial experiences in life. But for those who can't treat their experiences as food to growth, they will reach the point of refusing to associate with other people with one line "I'm not to blame.”
― Hinowa Kouzuki, 妖怪アパートの幽雅な日常 3