We must distinguish between the burden-bearing that is right and the burden-bearing that is wrong. We ought never to bear the burden of sin or of doubt, but there are burdens placed on us by God which He does not intend to lift off, He wants us to roll them back on Him.
"Cast that He hath given thee upon the Lord" (R.V. marg.) If we undertake work for the Lord and get out of touch with Him, the sense of responsibility will be overwelmingly crushinh; but if we roll back on God that which He has put upon us, He takes away the sense of responsibility by bringing in the realization of Himself.
Many workers have gone out with high courage and fine impulses, but with no intimate fellowship with Jesus Christ, and before long they are crushed. They do not know what to do with the burden, it produces weariness, and people say - "What an embittered end to such a beginning!"
"Roll thy burden upon the Lord" - you have been bearing it all; deliberately put one end on the shoulders of God. "The government shall be upon His shoulder." Commit to God "that He hath given thee"; not fling it off, but put it over on to Him and yourself with it, and the burden is lightened by the sense of companionship. Never dissociate yourself from the burden.