To be obedient to love, to give oneself over to its inherent dynamics, means, always, hearing the call to self-sacrifice, to self-abandonment, to let oneself be "broken". . . . The mystics tell us that we come to purity of heart by moving beyond ourselves; the Protestant tradition on holiness assures us that purity of heart lies in submission to the Holy; and the tradition of philosophical theism highlights the point that we are in fact always acting under obedience to some God. Thus, for all of them, purity of heart will only come when we give ourselves over to something above us.
— Ronald Rolheiser, The Shattered Lantern