Rain falls, wind blows, plants bloom, leaves mature and are blown away; these phenomena are all interrelated with causes and conditions, are brought about by them, and disappear as the causes and conditions change.
Rage is a powerful energy that with diligent practice can be transformed into fierce compassion. However much we disagree with our enemies, our task is to identify with them. They too feel justified in their point of view.
This is the entire spiritual life, Ananda, that is, good friendship, good companionship, good comradeship. When a monk has a good friend, a good companion, a good comrade, it is to be expected that he will develop and cultivate the Noble Eightfold Path.
Happiness follows sorrow, sorrow follows happiness, but when one no longer discriminates happiness and sorrow, a good deal and a bad deed, one is able to realize freedom.
Thus shall ye think of all this fleeting world: As star at dawn, a bubble in a stream A flash of lightning in a summer cloud A flickering lamp, a phantom, and a dream
If you see an intelligent man who tells you where true treasures are to be found, who shows what is to be avoided, and administers reproofs,follow that wise man ; it will be better, not worse, for those who follow him.
Peace comes from within. Do not seek it without. It can be argued that peace and happiness comes from the subjective internalised perspective of realizing things could be worse and being grateful they aren't. The alternative view that peace and happiness comes from the objective external perspective of having more and better things than at present, while important for growth, can be a never-ending source of jealousy, dissatisfaction and disappointment. A balance of the two, where people are grateful for what they have while striving for more seems the best blended perspective.
Solitude is happiness for one who is content, who has heard the Dhamma and clearly sees. Non-affliction is happiness in the world - harmlessness towards all living beings.