Check out,it's self-discipline.

Self-discipline is one of the most important and useful
skills everyone should possess. This skill is essential in
every area of life, and though most people
acknowledge its importance, very few do something to
strengthen it.
Contrary to common belief, self-discipline does not
mean being harsh toward yourself, or living a limited,
restrictive lifestyle. Self discipline means self control ,
which is a sign of inner strength and control of
yourself, your actions, and your reactions.
Self discipline gives you the power to stick to your
decisions and follow them through, without changing
your mind, and is therefore, one of the important
requirements for achieving goals.
The possession of this skill enables you to persevere
with your decisions and plans until you accomplish
them. It also manifests as inner strength, helping you
to overcome addictions, procrastination and laziness,
and to follow through with whatever you do.
One of its main characteristics is the ability to reject
instant gratification and pleasure, in favor of some
greater gain, which requires spending effort and time
to get it.
Self discipline is one of the important ingredients of
success. It expresses itself in a variety of ways:
Perseverance.
The ability not to give up, despite failure and
setbacks.
self control.
The ability to resist distractions or temptations.
Trying over and again, until you accomplish what
you set out to do.
Life puts challenges and problems on the path to
success and achievement, and in order to rise above
them, you have to act with perseverance and
persistence, and this of course, requires self-discipline.
The possession of this skill leads to self-confidence
and self esteem, and consequently, to happiness and
satisfaction.
On the other hand, lack of self discipline leads to
failure, loss, health and relationships' problems,
obesity, and to other problems.
This skill is also useful for overcoming eating
disorders, addictions, smoking, drinking and negative
habits. You also need it to make yourself sit and study,
exercise your body, develop new skills, and for self
improvement, spiritual growth and meditation.
As said earlier, most people acknowledge the
importance and benefits of self discipline, but very few
take real steps to develop and strengthen it. However,
you can strengthen this ability like any other skill. This
is done through training and exercises .