When we pray we are fulfilling a mitzvah. Therefore, just as a person has great concentration when fulfilling the mitzvah of shaking a Lulav and Esrog, a person should work on having great concentration when praying. Even if our prayers are not answered, we still receive a tremendous reward. So even if it seems like G-d is not answering us, another “mitzvah point” is added to our account, and the more concentration one has, the greater the mitzvah is.
4. Be kind to yourself. Speaking badly even about yourself is unethical.
הלכות שמירת הלשון 