To explain all nature is too difficult a task for any one man or even for any one age. ’Tis much better to do a little with certainty & leave the rest for others that come after you.

No single person can account for the whole of how the world works, and trying to is how good work gets abandoned halfway. A small piece established firmly is worth more than a grand system held loosely. What you settle stays settled, and someone after you can build on it without starting over.

Look at whatever you are working on and find the smallest part you could actually finish and be sure of. Do that part properly, and say plainly where your certainty ends. Letting the larger question stay open is not a failure of nerve.