Then [Jesus] said, “The kingdom of God is like a man scattering seed on the ground and then going to bed each night and getting up every morning, while the seed sprouts and grows up, though he has no idea how it happens. The earth produces a crop without any help from anyone: first a blade, then the ear of corn, then the full-grown grain in the ear. And as soon as the crop is ready, he sends his reapers in without delay, for the harvest-time has come.” (Mark 4)
You and I need only be profligate spreaders of His seed and, when He tells us, the sent harvesters of His eternal crop. Those are the only two calls on our life. We don't need to invent anything else. We, in fact, are living as the fulfillment of the prophecy of Amos:
“The days are coming,” declares the Lord, "when the reaper will be overtaken by the plowman and the planter by the one treading grapes. New wine will drip from the mountains and flow from all the hills..."
Our constant sowing and harvesting become one in the presence of the New Wine that is Jesus' shed blood. Our personal salvation is meant to catalyze our prayer and work for the salvation of others. Now. And every day of our lives.