The brilliance of Einstein in a simple paragraph:
“It was a sunny day, and Einstein merrily played with the telescope’s dials and instruments. Elsa came along as well, and it was explained to her that the equipment was used to determine the scope and shape of the universe. She reportedly replied, “Well, my husband does that on the back of an old envelope.”
When you are good at something, you make it look easy.
I doubt it is that easy, but your talent and long hours of deliberate practice makes it look painless and flawless.
Put in the hours, do the work, even on the back of an envelope.
Source: Einstein: His Life and Universe by Walter Isaacson