Hamza Yusuf said this quote
“ 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. ”