The Meaning of Life, the Universe, and Everything.
(This is Minecraft Survival Mode we're talking about, not survival>creative>survival)
You basically say something like:
You know your good at Survival Mode when you have a chest full of diamonds.
You know your good at Survival Mode when you kill something in one hit with your (enchanted) sword.
You know you're good at survival when you've spawned Herobrine (thanks to the Custom NPCs mod), gave him the highest stats possible... and still managed to beat him without getting yourself killed once.
You know you're good at survival when you fistfight Endermen on a regular basis... and win.
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"We must call for aid! Executor, bring out the Reavers! ... What? What do you mean we don't have reavers anymore? Then... send the Dragoons! ... Ugh, then what do you suggest? ... What's a Void Ray?!" -Tassadar, Savior of the Templar
You know you're good at suvival when you build a house the size of 3 large villages entirely made out of nether quartz, defeat the enderdragon, kill multiple withers, transformed the nether into a giant mineshaft, find all three strongholds, and build a mob arena with dungeons... all without dying once.