Sayings:

Why does haste in prayer occur? It is incomprehensible… What should one do?...Determine how many prayers can be done…in a given time and proceed in a calm and unhurried way to [keep track of them]. [Those who do so] stand with their minds before the Lord, or converse with Him in their own words, or recite some prayer, and this is how they reverently venerate His unending glory. Choose one…method for yourself and hold to it earnestly. You and I cannot go without definite rules. -Bishop Theophan the Recluse

Source: http://orthodoxinfo.com/praxis/theoph_prayer.aspx