Hamza Yusuf said this quote

Hypocrisy is wretched because the hypocrite says with his tongue what is not in his heart. He wrongs his tongue and oppresses his heart. But if the heart is sound, the condition of the tongue follows suit. We are commanded to be upright in speech, which is a gauge of the heart's state.

~ Hamza Yusuf

This is the difference between someone whose heart is purified and sound and one whose heart is impure and corrupt. Impure people oppress, and the pure-hearted not only forgive their oppressors, but elevate them in status and character. In order to purify ourselves, we must begin to recognize this truth. This is what this book is all about — a book of self-purification and a manual of liberation. If we work on our hearts, if we actually implement what is suggested here, we’ll begin to see changes in our lives, our condition, our society, and even within our own family dynamics. It is a blessing that we have this science of purification, a blessing that this teaching exists in the world today. What remains is for us to take these teachings seriously.Signs, Symptoms and Cures of the Spiritual Diseases of the Heart. Translation and Commentary of Imam Mawlud's Matharat al-Qulub. Schaykh Hamza Yusuf. E-Book S. 10

~ Hamza Yusuf

It is of the extraordinary insights of Imam Malik that the first section of his Muwatta'*, which precedes even the section on ritual purity, is on the times of the prayer. It is the times of prayer that obligate purity. Observing the times of prayer is the first thing we do when we wake and the last thing we do before retiring to bed; it is done in the middle of the day and in its decline. It is an unrelenting reminder of to whom we belong, why we are here, and where we are going.

~ Hamza Yusuf

Exercise 1: Guarding the PrayerOnce we are performing the five obligatory prayers with regularity, then it is certainly worth our efforts to begin increasing extra prayers- especially the late-night prayers (tahajjud). Late-night prayer is one of the defining qualities of a salih (righteous) person, also called a wali (friend of Allah). Regarding late-night prayers, Fudayl b. 'Iyyad said that if a man was unable to do them, it was due to his wrong actions during the day. May Allah make us befitting to stand before Him, here and in the hereafter.Agenda to Change our Condition, Hamza Yusuf & Zaid Shakir, S. 46

~ Hamza Yusuf