I saw this quote in an article written by Victor M. Parachin in The Family Digest (Vol. 65, No. 4, page 32).
God has created me to do Him some definite service.
He has committed some work to me which He has not committed to another.
I have a mission; I may never know it in this life, but I shall be told it in the next.
I am a link in a chain, a bond of connection between persons; He has not created me for naught.
I shall do good- I shall do His work.
I shall be an angel of peace while not intending it if I do but keep His commandments.
Therefore, I will trust Him.