Dua...
1 indicates belief in Allah's existence
2 indicates belief in His ability to hear and know our thoughts & needs
3 indicates belief in His qudra, power to change things
4 is an expression of our humility towards Him
5 is an admission of our weakness & His greatness
6 has an immediate benefit to our spiritual state
7 is not limited to only the pious
8 is always answered when asked with true desperation
9 is especially beloved to Allah when done much
10 is for all things big or small, worldly or spiritual
11 is so beloved to Allah, He is angered when we leave it off
12 can be aloud, silent, or simply in your thoughts
13 is the only force that can alter one's destiny
14 must be done with certainty that He will answer