human being; human; person; character (of a person)
durability; persistence; stamina; endurance; staying power
not less than ...; ... and over; beyond (e.g. one's expectations); above; the above; the above-mentioned
to polish; to shine; to burnish; to refine (a skill, etc.); to improve; to hone
necessary; needed; essential; necessity; need; requirement
to be sufficient; to be enough; to be worth doing; to be worthy of; to do (the job); to serve
to feel (as if); to have a feeling (that); to have a hunch (that); to feel like doing; to want to do
core; heart (of the matter); point; crux; kernel
to seize; to catch; to obtain; to acquire; to understand; to grasp
immediately; as soon as possible; as quickly as possible
for; for the sake of; to one's advantage; because of; as a result of