From the Gita
Restraining desire
Arjuna asks why we do wrong as if forced. Krishna names desire, which turns into anger, as the enemy that clouds wisdom like smoke over fire, and tells him to master it.
Desire unmet becomes anger; see it clearly and you can master it.
From the Poets and saints
Vairagyashatakam: Censure of craving
The poet confesses everything he did for money and approval: digging for treasure, flattering kings, forcing laughter. He ends with the famous lines that pleasures consumed us and craving never aged, and hope pictured as a river.
We think we are chasing things; really, the chase is using up our lives.
From the Other Gitas
Tulsidas, the boy who begged for scraps
Across his later works Tulsidas tells his own story: left by his parents at birth, he wandered door to door for scraps, no job, no trade, no skill, ignored by everyone. Good people told him not to worry; Hanuman raised him like a child; Ram's name, he says, turned a thorny babul into a mango tree. Even when he went astray, he was taken back.
Where you start is not where you end; you can be taken in from nothing.
From the Mahabharata
Vyadha Gita: the butcher who taught a sage
A proud ascetic, Kaushika, is sent to learn from a meat-seller in Mithila. The butcher teaches him plain goodness: don't return evil, repent and resolve, keep envy away, care for your parents, and don't spend your one life making enemies.
Wisdom lives in ordinary people doing ordinary work honestly. Care for your parents.