To achieve satisfaction that you have done to best of your abilties,
i will quote:
Arunkumar Ramanlal Gandhi after successful bidding for Corus by Tata
We endeavour to deliver the best. However, the results are not in our hand. Jainism, which is older than Buddhism, teaches us to work hard and be happy, without being concerned about the end results," he adds.
Ofcourse he achieved success for Tata company, but even if he would have failed - Arunkumarji could have sai 'I got this great opprtunity to participate in the bid'
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Ambition and ability to work hard are the two important things to achieve the great things, the great things may change person to person, those things which i consider great in my life may not be considered great by you, so be confident