The key to happiness is ...

The key to happiness is accepting one unpleasant reality every day.
The key to happiness is accepting one unpleasant reality every day.

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Don't settle in the land of barely enough. That is where you are, it is not who you are. That's your location, it's not your identity. No matter what it looks like, have an abundant mentality.
The by-product is that they more people you help, the "richer" you become, mentally, emotionally, spiritually, and definitely financially.
 T. Harv Eker
Happiness doesn't depend on any external conditions, it is governed by our mental attitude.
The truth is incontrovertible. Malice may attack it, ignorance may deride it, but in the end, there it is.
To improve is to change; to be perfect is to change often.

Quotes from the same author

Collective fear stimulates herd instinct, and tends to produce ferocity toward those who are not regarded as members of the herd.
We may say, in a broad way, that Greek philosophy down to Aristotle expresses the mentality appropriate to the City State; that Stoicism is appropriate to a cosmopolitan despotism; that stochastic philosophy is an intellectual expression of the Church as an organization; that philosophy since Descartes, or at any rate since Locke, tends to embody the prejudices of the commercial middle class; and that Marxism and Fascism are the philosophies appropriate to the modern industrial state.
To conquer fear is the beginning of wisdom.
The happiness that is genuinely satisfying is accompanied by the fullest exercise of our faculties and the fullest realization of the world in which we live.
Real life is, to most men, a long second best, a perpetual compromise between the ideal and the possible.