A great part of the burden of daily life is the sin that is in it. Take out the sin, and there will not be much burden left.
I. As regards those common burdens which every one bears, God says, "Cast thy burden on the Lord." It is very difficult to sympathise with one another's burdens; and of course each, knowing only his own, thinks his own the heaviest. Christ alone can sympathise with all. But your burden is the one main thing you have to do with, suited for present discipline, a selected, ordained, adjusted thing "thy burden." Leave the balancing, and trust the Balancer.
II. What is casting? It needs an effort to believe. It needs an effort to do the first step; it needs an effort to make it once and for ever. What is the way? (1) Take loving views of Jesus of His sympathy, His nearness, His power, His undertakings, His interest, personal, in you. (2) Open to Him your whole heart, not the burden only, but what surrounds it. (3) Do not go back to your own castings. Put them too far away for that.
III. Observe how the Lord deals with cast burdens. He does not say, "I will take away thy burden," but "I will sustain thee." To this end He will unite Himself to you more closely, so that, just as the ivy on the rock, you will both borrow a strength from the rock not your own and pass on to the rock the pressure that you feel. He will be "your arm every morning," on which leaning you cannot faint. He will feed you with such hidden manna that you will grow so strong that you can carry anything.
J. Vaughan, Fifty Sermons,8th series, p. 147.
References: Psalms 55:22. Preacher's Monthly,vol. ii., p. 30. Psalms 55 A. Maclaren, Life of David,p. 240; J. Hammond, Expositor,1st series, vol. iv., p. 67. Psalms 56:3. A. Rowland, Christian World Pulpit,vol. xxiii., p. 404.