“When ambition ends, happiness begins.”
` Thomas Merton

More on ambition:
“Focusing your life solely on making a buck shows a certain poverty of ambition. It asks too little of yourself. Because it’s only when you hitch your wagon to something larger than yourself that you realize your true potential.”
~ Barack Obama
“Our ambition should be to rule ourselves, the true kingdom for each one of us; and true progress is to know more, and be more, and to do more.”
~ Oscar Wilde
“Five enemies of peace inhabit with us – avarice, ambition, envy, anger, and pride; if these were to be banished, we should infallibly enjoy perpetual peace.”
~ Petrach
Am bi tion
/am’biSH(e)n/ noun
1) A strong desire to do or to achieve something, typically requiring determination and hard work.
Similar: aspiration, intention, goal, aim, objective, object, purpose
2) A desire and determination to achieve success.
Similar: drive, determination, desire, enterprise, initiative, eagerness