The parable of the workers and the winegrower has the meaning that the main reward is not money, but labor. The very opportunity to work is happiness. Lack of work causes people unbearable suffering. By giving people work, God saves them from suffering.
Nirvana is a reward for hard work and good work. Nirvana is like orgasm, the result of good sex. However, the meaning of sex-children and fruitfulness. To use the orgasm, sex and meditation as an analogue of Masturbation is a sin of lust and addiction, the source of much suffering.
You don't look a gift horse in the mouth, so you can't criticize what Providence gives a person. Everything that comes to you should be taken and enjoyed. All that goes away, to give without regret to wounded pride.
One cunning person, knowing that problems are good, invented his own problems. Then he heroically and successfully solved them ... reported to his superiors and received for this gingerbread, carrots, orders and medals.
"Don't believe, don't be afraid, don't ask» it's all about the devil's temptations. Don't believe your doubts. Don't be afraid of your fears. Do not ask for or desire pleasure, power, vanity, love, or rewards.
Proud people are hungry for love and want to do good, and they want to be grateful for it. On the other hand, too much gratitude creates complacency and emotional overdose in them. Overdose is withdrawal, fear, aggression, etc.