Matthew 28:18-20: And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth. Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, [even] unto the end of the world. Amen.
Q16: HAS JESUS CHANGED HIS PROMISE TO MANKIND?
Malachi 3:6: For I [am] the LORD, I change not.
Hebrews 13:8: Jesus Christ the same yesterday, and to day, and for ever.
Acts of the Apostles, p. 50: The lapse of time has wrought no change in Christ's parting promise to send the Holy Spirit as His representative. It is not because of any restriction on the part of God that the riches of His grace do not flow earthward to men. If the fulfilment of the promise is not seen as it might be, it is because the promise is not appreciated as it should be. If all were willing, all would be filled with the Spirit.
Q17: WHO WAS ULTIMATELY RESPONSIBLE FOR THE SUCCESS OF THE WORK OF THE DISCIPLES?
Testimonies for the Church, vol. 8, p. 16: Christ made full provision for the prosecution of the work entrusted to the disciples, and took upon Himself the responsibility of its success. So long as they obeyed His word, and worked in connection with Him, they could not fail.
Q18: WILL JESUS WORK WITH US IN THE SAME WAY? IF SO, WHEN?
Evangelism, p. 697: When we bring our hearts into unity with Christ, and our lives into harmony with His work, the Spirit that fell on the disciples on the day of Pentecost will fall on us.
Desire of Ages, p. 825: It is in doing Christ's work that the church has the promise of His presence. Go teach all nations, He said; "and, lo, I am with you alway, even unto the end of the world." To take His yoke is one of the first conditions of receiving His power. The very life of the church depends upon her faithfulness in fulfilling the Lord's commission. To neglect this work is surely to invite spiritual feebleness and decay. Where there is no active labour for others, love wanes, and faith grows dim.
Q19: HOW SHOULD THE GOSPEL BE PRESENTED AND HOW SHOULD WE PRESENT OURSELVES?
Desire of Ages, p. 826: The gospel is to be presented, not as a lifeless theory, but as a living force to change the life. God desires that the receivers of His grace shall be witnesses to its power.
Education, p. 18: Higher than the highest human thought can reach is God's ideal for His children. Godliness--godlikeness--is the goal to be reached.
Remember that "talents used are talents multiplied" and that "if we use our means for His glory, He will give us more" (Christ's Object Lessons, pp. 353, 354). Also, we should not be satisfied with conquest in part. We cannot be satisfied with crumbs when Jesus has set a banquet table for us!