These excerpts are taken from I book I just finished called: "The Sovereignty of God" by A.W. Pink, a true classic full of biblical truth.
"It is not until the sinner despairs of any help from himself that he will ever fall into the arms of Sovereign mercy; but if once the Holy Spirit convicts him that there is no help in himself then he will recognize that he is lost, and will cry, "God be merciful to me a sinner," and such a cry will be heard." (pg. 161)
"The success of the ministry which He has committed into our hands is not left contingent on the fickleness of the wills in those to whom we preach. How gloriously encouraging, how soul-sustaining the assurance are those words of our Lord’s if we rest on them in simple faith: “And other sheep I have (“have” mark you, not “will have”; “have” because given to Him by the Father before the foundation of the world), which are not of this fold (i.e. the Jewish fold then existing): them also I must bring, and they shall hear My voice” (John 10:16). Not simply, “they ought to hear My voice,” not simply “they may hear My voice,” not “they will if they are willing.” There is no “if,” no uncertainty about it. “They shall hear My voice” is His own positive, unqualified, absolute promise. Here then is where faith is to rest! Continue your quest, dear friend, after the “other sheep” of Christ’s. Be not discouraged because the “goats” heed not His voice as you preach the Gospel. Be faithful, be scriptural, be persevering, and Christ may use even you to be His mouthpiece in calling some of His lost sheep unto Himself. “Therefore, my beloved brethren, be ye steadfast, unmoveable, always abounding in the work of the Lord, forasmuch as ye know that your labor is not invain in the Lord” (1 Cor. 15:58)." (pg. 175)