Being unable to resist temptation is not the reason for indiscipline. I realized the reason why I don't have self-discipline. It was because I could not stand with the pressures, and didn't have a clear method to aim at my goals. At first, I thought if we didn't have discipline, then we couldn't resist temptation. But I stayed up all night once and did nothing except watching the extremely boring videos on my phone. Suddenly, I realized that those things were not temptations for me, they were just a way to escape my pressures.