A quote from John Piper's essay, "Talking to Your Tears:"
“Those who sow in tears shall reap with shouts of joy! He who goes out weeping, bearing the seed for sowing, shall come home with shouts of joy, bringing his sheaves with him.” Psalm 126:5-6
“This psalm teaches the tough truth that there is work to be done whether I am emotionally up for it or not, and it is good for me to do it. Suppose you are in a season of heartache and discouragement, and it is time to sow seed. Do you say, ‘I can’t sow the field this spring, because I am brokenhearted and discouraged’? If you do that, you will not eat in the winter. Suppose you say instead, ‘I am heartsick and discouraged. I cry if the milk spills at breakfast. I cry if the phone and doorbell ring at the same time. I cry for no reason at all, but the field needs to be sowed. That is the way life is. I do not feel like it, but I will take my bag of seeds and go out in the fields and do my crying while I do my duty. I will sow in tears.’
If you do that, the promise of this psalm is that you will ‘reap with shouts of joy.’ You will ‘come home with shouts of joy, bringing your sheaves with you,’ not because the tears of sowing produce the joy of reaping, but because the sheer sowing produces the reaping. We need to remember this even when our tears tempt us to give up sowing.”
----A Godward Life, pp. 89-90