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Rise up and put on strength, Oh arm of the Lord, for by thee the work of the Lord is accomplished.
¶Awake, awake, put on strength, O arm of the LORD; awake, as in the ancient days, in the generations of old. Art thou not it that hath cut Rahab, and wounded the dragon? Isaiah 51:9
¶Therefore, my beloved brethren, be ye stedfast, unmoveable, always abounding in the work of the Lord, forasmuch as ye know that your labour is not in vain in the Lord. 1 Corinthians 15:58

Yea, the body consists of many members.
1 Corinthians 12:12  ¶For as the body is one, and hath many members, and all the members of that one body, being many, are one body: so also is Christ.
13  For by one Spirit are we all baptized into one body, whether we be Jews or Gentiles, whether we be bond or free; and have been all made to drink into one Spirit.
14  For the body is not one member, but many.

But it is the arms and the hands that does the work.
Ephesians 4:11  And he gave some, apostles; and some, prophets; and some, evangelists; and some, pastors and teachers;
12  For the perfecting of the saints, for the work of the ministry, for the edifying of the body of Christ:

The harvest is plenteous, but the laborers are few.
Then saith he unto his disciples, The harvest truly is plenteous, but the labourers are few; Matthew 9:37

Many are members of the body of Christ but few they are that labor.
1 Corinthians 12:27  ¶Now ye are the body of Christ, and members in particular.
28  And God hath set some in the church, first apostles, secondarily prophets, thirdly teachers, after that miracles, then gifts of healings, helps, governments, diversities of tongues.
29  Are all apostles? are all prophets? are all teachers? are all workers of miracles?
30  Have all the gifts of healing? do all speak with tongues? do all interpret?

The hands are small compared to the rest of the body, but they accomplish all the work.
1 Corinthians 12:15  If the foot shall say, Because I am not the hand, I am not of the body; is it therefore not of the body?
16  And if the ear shall say, Because I am not the eye, I am not of the body; is it therefore not of the body?
17  If the whole body were an eye, where were the hearing? If the whole were hearing, where were the smelling?
18  But now hath God set the members every one of them in the body, as it hath pleased him

So it is with the body of believers, few they are who devote their lives to advance the Kingdom of Jesus Christ.
Therefore said he unto them, The harvest truly is great, but the labourers are few: pray ye therefore the Lord of the harvest, that he would send forth labourers into his harvest. Luke 10:2

Their reward is great.
But love ye your enemies, and do good, and lend, hoping for nothing again; and your reward shall be great, and ye shall be the children of the Highest: for he is kind unto the unthankful and to the evil. Luke 6:35
Matthew 6:19  ¶Lay not up for yourselves treasures upon earth, where moth and rust doth corrupt, and where thieves break through and steal:
20  But lay up for yourselves treasures in heaven, where neither moth nor rust doth corrupt, and where thieves do not break through nor steal:
21  For where your treasure is, there will your heart be also.