Fourth phrase:

His is the Kingdom means that He owns  the heavens and Earth—including you—and that you work in His Kingdom. It also implies: Do not imagine that you own yourself, for you cannot administer your own affairs. You cannot maintain your spirit and body by meeting their needs and securing them against calamity. You cannot avoid exhaustion and aging, because you are subject to time and other erosive factors. Therefore, do not suffer pain and torment without reason. Somebody All-Powerful and All-Compassionate owns everything. Rely on His Power and do not accuse His Compassion. Renounce grief and anxiety and accept relief. Be rid of your troubles and find serenity.

This phrase also means: This world that you love, to which you are connected and which you see in disorder and cannot put right, belongs to an All-Powerful and Compassionate One. So return it to its Owner and leave it to Him. Mind your own duty and do not interfere with His acts. Do not be troubled by what you cannot overcome. Be at ease, for its Owner controls it completely and administers it as He wills. He is All-Wise and All-Compassionate, and acts for a wise purpose. So whenever you are afraid, say like Ibrahim Haqqi: “Let’s see what the Master does—whatever He does is always best—and observe His acts with complete trust.”