I applied my heart to seek and to search out by wisdom concerning all that is done under the sky. It is a heavy burden that God has given to the sons of men to be afflicted with.
TSK
TSK · Ecclesiastes 3:10
Treasury of Scripture Knowledge references in WEB.
For you remember, brothers, our labor and travail; for working night and day, that we might not burden any of you, we preached to you the Good News of God.