There is a set time for everything designed by God and when done in that perfect time and in the perfect manner, the act is pleasing to the Master and makes Him happy.
Jesus once said....
"I must work the works of Him who sent Me while it is day; the night is coming when no one can work."
John 9:4 (NKJV)
Also in a different circumstance He said...
"Behold, I say to you, lift up your eyes and look at the fields, for they are already white for harvest!" John 4:35 (NKJV)
If you walk through the streets near your house, or look through for people while driving, or switch on the television you can see the potentiality of sowing and harvest everywhere.
Amongst the literate and illiterate, the rich and the poor, in every part of the world the greatest need of the hour is to know Christ.
Many(not all) who are financially stable are corrupt at heart and stubborn in nature....they need Christ to get right, many (not all) who are poor use wrong ways to fulfill their needs...they need Christ to get right.
No excuse can justify sin and the basic necessity of every person is Christ.
The people whom we meet have all in their life, but Christ, only those who have experienced the presence of the Lord God in their life can understand the void and sorrowful state of those who do not know Him.
Jesus came with a task and completed His part, however He is still fulfilling the blessed work of changing the lives through many of us.
We have our day(this blessed life) and we have our task, how faithful are we to lead others to Christ, to show them the truth that can wipe away all lies from their heart, to show them the love of God that can wipe out all bitterness and pain.
I am sure that we as an individual would find it difficult to reach the whole world for Christ, however we can do our part.
A certain man was once walking on the beach and was throwing back into the sea some of the starfish that had washed out due to the waves, another person watching him carefully shouted and told him "Sir, there are millions of them there, do you think you could save all of them?", the person replied holding a starfish in his hand, "I don't know about the others, but for this one (looking at the fish in his hand) I can save it", and he threw it back into the sea and kept walking saving others.
There are many people whom we can reach for Christ and introduce them to a life of blessedness and hope in Christ, we have a task to be completed this day.