Perseverance

"A jug fills drop by drop." This means that even though you're going drop by drop eventually you will fill the jug. Sometimes there will be bigger droplets and sometimes there will be smaller ones, but in the end you will fill the jug. This is like perseverance, if you keep going, drop by drop, you will make it eventually. Sometimes it's gonna feel like you won't make it and it might be a small step or drop, but you will full your jug.

"Perseverance is failing 19 times an succeeding the 20th." If you keep trying, and improving along the way, you will succeed. You'll probably fail many, many times, but if you keep trying there will be a time where you accomplish your goal.