We can grow impatient when it comes to "getting something that we want" and
we go ahead 
try to "work it out" rather than waiting upon the Lord for the outcome...
We have to be careful not to "run ahead of God" but seek His will to "keep up with Him." This would be the place where impatience and (lack of) faith can collide.
James 1:2-4 (KJV)
My brethren, count it all joy when ye fall into divers temptations; Knowing this, that the trying of your faith worketh patience. But let patience have her perfect work, that
ye may be perfect and entire, wanting nothing.