Heifetz on Practice

My violist friend Joy Pile gave me this quote:  

Heifetz said “if I don’t practice after one day I will notice, after two days the critics will notice, and after three days all the audience will notice.”

Here’s one another from the Jascha Heifetz official web site:

Prac­tice like it means every­thing in the world to you. Per­form like you don’t give a damn.” (http://www.jaschaheifetz.com/about/jascha-heifetz-violinist-nonpareil/)