The Pope describes several erroneous opinions regarding this devotion. There are those, who consider it burdensome and of little or no use to men. Others consider this devotion as a piety suited for women, and not for educated men. There are those who consider a devotion of this kind as primarily demanding penance, expiation and the other virtues which they call "passive," meaning thereby that they produce no external results. Hence they do not think it suitable to re-enkindle the spirit of piety in modern times. The encyclical replies with Pope Pius XI: The veneration of the Sacred Heart is a summary of all our religion and, moreover, a guide to a more perfect life. It more easily leads our minds to know Christ the Lord intimately and more effectively turns our hearts to love Him more ardently and to imitate Him more perfectly." "Haurietis aquas" opines that the Sacred Heart never ceased, and never will cease, to beat with calm. It will never cease to symbolize the threefold love with which Jesus Christ is bound to His heavenly Father and the entire human race.