These posts are only suggestions you may use at your own discretion.
The guarantee you'll want to hold tight to is quoted here from Psalm 126:6
He that goeth forth and weepeth, bearing precious seed, shall doubtless come again with rejoicing, bringing his sheaves with him.
My own mission is in the "Grandfather's Psalm" 71:18:
Now also when I am old and grayheaded, O God, forsake me not; until I have shewed thy strength unto this generation, and thy power to every one that is to come.