Displeasure with Blame

from Purification of the Heart : Translation and Commentary of Imam al-Mawlud's Matharat al-Qulub; by Hamza Yusuf, page 131.

Displeasure with blame is a well-known disease of the heart. Concern with people's opinions and desiring their praise and displeasure at their criticisms are a barrier from achieving the station of excellence in worship. Overcoming that barrier is through the realisation that there is no benefit or harm unless it comes from God, the Possessor of all dominion, Exalted and Majestic is He.
Furthermore, what is prohibited from this disease is what leads to the prohibited, just as Imam al-Ghazali has elaborated.
The perfection of sincerity is that you do not give notice to any praise or blame that emanates from people.

The Prophet (s.a.w.) said to Ibn Abbas, "Be mindful of God, and God will protect you. Be mindful of God, and you will find Him in front of you. If you ask, ask of God. If you seek help, seek help from God. Know that if the whole nation were to gather together to benefit you with anything, it would only benefit you only with something that God had already prescribed for you. And if the whole nation were to gather together to harm you, it would harm you only with something that God had already prescribed for you. The pens have been lifted and the ink has dried."