He saw clearly to diagnose the labored and burdened state of the souls He loved. The laboring was a striking against, a beating, a laborious toil, trouble, resulting in weariness. Jesus saw they were being burdened. They were bearing, carrying a load unyoked with anyone to share it with them. Jesus speaks to these ones the word of rest.
Rest comes when one's feet are raised UP on a bed or easy chair.
And so these men hear the Lord and go on. Already the precious word of rest will be challenged. Jesus could see. What a tender conscience is in our standing. Jesus comes to their aid and speaks His verdict.