A lot of us answered focus and persistence.
Yes to those.
My answer is also similar to OriginArtz's: Seek ye first the Kingdom and all these things (e.g. success) will be added unto you.
If we understand that seeking the kingdom is actually following your bliss, your innate talent that God breathed in you, we can never fail.
This is because it is easy for us to achieve our goals once we apply our natural talents with focus. After seeing positive results from this procedure, we are overjoyed and decide to do it again. And it proceeds with a snowball effect.