You may call it stubbornness,
Perseverance Goal-oriented Self-motivated
I call it perseverance!
To me there is no choice but to finish what I started. Although, I am not sure yet whether this is a good or a bad virtue, it certainly contributes to achieving goals well-picked.
Truth is I do not enjoy uncertainty. Contrarily, I am quite efficient when I have a well-defined goal that I need to reach, even when the path leading there is not clear. Then I will inevitably get obsessed with doing what I set my mind on…
It becomes like a personal challenge to me.
For instance, I set my mind to learn German during my undergraduate degree. I achieved that beside the admittedly demanding school I was attending, by painstakingly studying for two years to pass the B2 level in German. Another personal challenge, was that of moving from the electrical and computer engineering field outside of my comfort zone to a PhD in bio-engineering. I did so, not because I enjoy the field per se, but because it is the impact of my work that matters to me. In this case, being able to help in the study of colorectal cancer was the catalyst that pushed me towards that endeavor and kept me going till the end.
No-matter the challenge, if it is interesting or for a greater purpose, I’m in for good.

