Like every other person on the face of the earth, you will have your low moments when discouragement or frustration will threaten to grip you.
What you do at such moments determines whether you will belong to the class of winners or losers.
The losers allow discouragement and frustration to crush them. The winners crush discouragement and frustration.
Crush or be crushed.
You must never allow discouragement or frustration to crush you. Instead, you crush them and march forward to victory.
Hence, I reiterate crush or be crushed.