Is it enough to pray when you feel like praying?
No. Someone who prays only when he feels like it does not take God seriously and will leave off praying. Prayer thrives on faithfulness. 
Posts tagged Catholic
There is no evil to be faced that Christ does not face with us. There is no enemy that Christ has not already conquered. There is no cross to bear that Christ has not alreasy borne for us, and does not now bear with us.
One cannot desire freedom from the cross when one is especially chosen for the cross. […] The more lofty the degree of loving union to which God destines the soul, so much more profound and persistent must be its purification.
Saint Theresa Benedicta of the Cross (Edith Stein)