"No working is true working".
There is a Japanese word, hakarai. translated as "calculation".
Suzuki, in his little book on Amida, equates "calculation" with the Christian "pride".
Hakarai is the noun form of a verb meaning to deliberate, analyze, and determine a course of action. It further means to arrange or manage, to work out a problem, to bring a plan to conclusion. In Shinran's more common usage, as a synonym for self-power, it refers to all acts of intellect and will aimed at achieving liberation. Specifically, it is the Shin practicer's efforts to make themselves worthy of Amida's compassion in their own eyes, clinging to their judgments and designs, predicated on their own own goodness, for attaining religious awakening.
For Shinran, salvation lies rather in the complete entrusting of oneself to the Primal Vow, which works to bring about "the attainment of Buddhahood by the person of evil". This working is Amida's hakarai/calculation. Hakarai, then, possesses two opposed meanings, as a synonym for both self-power and Other Power, and its usage reflects the core of Shinran's religious thought, where one's calculative thinking and Amida's working are experienced as mutually exclusive. Great compassion illumines everyone at all times, but any contrivance to attain enlightenment by cultivating one's own virtues or capabilities - whether through moral action or religious practice - will blind one to it, making sincere trust (shinjin) impossible. Only when a person realizes his or her true nature as a foolish being, all of whose acts and thoughts arise from blind passions, do they awaken to the great compassion that grasps them just as they is. To know oneself and to know Amida's compassion are, in fact, inseparable aspects of the same realization, and one awakens to them simultaneously. In this awakening, one's own hakarai/calculation disappears and entrusting oneself to Amida's Vow actually comes about for the first time. Thus Shinran states, "No working (practicer's hakarai) is true working (Amida's hakarai)."
As true entrusting arises wholly from Other Power, the practicer is completely passive. Even seeking to know oneself as evil or to rid oneself of hakarai in order to accord with the Primal Vow is itself hakarai, and all such effort is futile and self-defeating. This is the paradox the Shin practicer faces. The admonition against hakarai does not mean, however, that one must renounce the aspiration for enlightenment and do nothing at all.
As a slight counterpoint to this, and to help illuminate the words, here is Thomas Merton, speaking form a Christian perspective....
In speaking of the recovery of innocence (the reversal of the "fall" ) the Christian doctrine of grace teaches us that this cannot be the work of our own "self". It is useless for the "self" to try to "purify itself," or for the "self" to "make a place in itself" for God. The innocence and purity of heart which belongs to paradise are a complete emptiness of self in which all is the work of God, the free and unpredictable expression of His love, the work of grace. In the purity of original innocence, all is done in us but without us. But before we reach that level, we must also learn to work on the level of "knowledge" where grace works in us but "not without us".
(Excerpt for "Wisdom in Emptiness", from the book "Zen and the Birds of Appetite" )
For me, it is finding two such similar insights into Grace, drawn from the actual experience of such, in two human beings who were born far apart and raised in two totally different Faiths and cultures, that help in my own surrender to grace.