If it is true that...

Working on something exciting is not always straightforward and requires techniques similar to sailing

and

Starting work can be more difficult than continuing it

Then it must be true that...

Hard work is required to do great things

If it is true that...

Working too hard can lead to diminishing returns due to fatigue

and

Starting work can be more difficult than continuing it

Then it must be true that...

Great work involves expanding people's ideas of what's possible

If it is true that...

Starting work can be more difficult than continuing it

and

Finishing a project can lead to significant work and discoveries in the final stages

Then it must be true that...

Hard work is required to do great things