As a part of an Orthodox Christian's morning prayers, there is one prayer in particular that converses with God about gaining and maintaining personal peace throughout the day. It is a favorite of mine and one that I try to recall during the course of the day.
O Lord, grant me to greet the coming day in peace.
Help me in all things to do Your holy will.
In every hour of the day, reveal Your will to me.
Bless my dealings with those who surround me.
Teach me to treat all that comes to me throughout the day
with peace of soul and firm conviction that Your will governs all.
In all my deeds and words, guide my thoughts and feelings.
In unforeseen events, let me not forget that all are sent by You.
Teach me to act firmly and wisely without embittering and embarrassing others.
Give me strength to bear the fatigue of the coming day with all it shall brings.
Direct my will, teach me to pray, and You, Yourself, pray in me.
I especially love the two sentences in bold. It reminds me that every single person is known by God and that my reaction to this person is also known. Lovely thing to contemplate, easy thing to forget.