The ability to be happy.
A sense of humour!
The ability to be happy while also being alone.
Resilience – the ability to bounce back, the courage to come back:
Life won’t always be fair to you. The ability to bounce back and the attitude of not giving up on life is a rare trait worth trying hard to cultivate.
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The ability to make people laugh!
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The ability to forgive and forget.
The ability to learn (also from your mistakes).
The ability to let go – Of Stuff and of Guilt and of Blame.
Getting out of your comfort zone:
Being completely honest with yourself, and both strict and patient with – even kind to – yourself.
Realising how fortunate you are. The knowledge that you have enough already.
The ability to love yourself – and then to radiate that love outwards.
The willingness to try new stuff with enthusiasm.
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These answers were given by various quora.com writers. I chose the ones I liked best and can learn from!