Patience is not a sign of weakness, but of strength under control. The patient person may respond to problems with strength and action, but his response is always a chosen, careful, controlled response. The patient person responds with compassion, mercy, gentleness, etc. He does not respond with anger, resentment, discouragement, etc. Irritability is as terrible as it is common.
Irritability is a sin which betrays a lack of wisdom, love, and patience.
There could not be a more apt way of describing what patience really is. Indeed we count them blessed who endure. Our impatience is often the result of simple tiredness. Impatience usually comes down to a problem of self-control. The person who lashes out in exasperation is out of control.