Swami Vivekananda - The one great advantage of Bhakti is that it is...

The one great advantage of Bhakti is that it is the easiest and most natural way to reach the great divine end in view; it's great disadvantage is that in its lower forms it oftentimes degenerates into hideous fanaticism. The fanatical crew in Hinduism, Mohammedanism, or Christianity, have always been almost exclusively recruited from these worshippers [] on the lower planes of Bhakti. That singleness of attachment (Nishthâ) to a loved object, without which no genuine love can grow, is very often also the cause of the denunciation of everything else. All the weak and undeveloped minds in every religion or country have only one way of loving their own ideal, i.e., by hating every other ideal. Herein is the explanation of why the same man who is so lovingly attached to his own ideal of God, so devoted to his own ideal of religion, becomes a howling fanatic as soon as he sees or hears anything of any other ideal.