if you can't stand the heat
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if you can't stand the heat, get out of the kitchen
If you can't cope with or handle the pressure in a given situation, you should remove yourself from that situation. Typically used to imply that the one being addressed is weak or unsuited for such work. The expression was popularized by US President Harry S. Truman. The pace is only going to pick up from here, newbie, so if you can't stand the heat, get out of the kitchen.