Rabenu Yona points out in Pirkei Avos 1:2 that prayer is stronger than the karbonos (offerings brought in the Temple). The proof is Dovid HaMelech committed a sin that he could not bring a karbon for. But he was still able to pray. Therefore, our prayers are greater than the karbonos that used to be brought!
4. Be kind to yourself. Speaking badly even about yourself is unethical.
הלכות שמירת הלשון 