It is very important to have proper concentration during the first paragraph of Shemone Esray. The Sifsei Chaim says the reason is because this paragraph defines our relationship to G-d. We declare that we are lacking and that G-d created us and constantly provides for us by doing deeds of kindness. He is the only one who truly provides us with everything we need.
4. Be kind to yourself. Speaking badly even about yourself is unethical.
הלכות שמירת הלשון 