Amir al-mu'minin:

الْمَرْءُ مَخْبُوءٌ تَحْتَ لِسَانِهِ
Man is hidden under his tongue.

هَلَكَ امْرُؤٌ لَمْ يَعْرِفْ قَدْرَهُ
Whoever does not know his price will vanish.

He elsewhere says your price is Paradise, so don't sell yourself with a low price.