If it is true that...

The work one chooses should be something they have a natural aptitude for, deep interest in, and offers scope to do great work

Then it must be true that...

Great work involves the combination of ability, interest, and effort

If it is true that...

The work one chooses should be something they have a natural aptitude for, deep interest in, and offers scope to do great work

and

Enjoying even the tedious or frightening parts of a job is an indication that one is suited for that kind of work

Then it must be true that...

Great work involves the combination of ability, interest, and effort

If it is true that...

The work one chooses should be something they have a natural aptitude for, deep interest in, and offers scope to do great work

and

Interest in a subject can drive one to work harder than diligence alone

Then it must be true that...

Great work involves the combination of ability, interest, and effort