“Say to the Israelites: ‘I am the Lord, and I will bring you out from under the yoke of the Egyptians’”. 

Ex 6:6 NIV 

History has thrown up many instances of one nation conquering and enslaving another one. It has nearly always led to exploitation of the conquered by the conquering power, resulting in hardship, bitterness and strife. No nation wants to be trampled on by another. Often efforts by the subject nation to rid themselves of the foreign domination have led to yet more suffering. 
That is how it was with the Israelites in Egypt – only they were the foreigners and were seen as a threat to the Egyptians. In this verse God promises, through Moses, that he will rescue them from their bondage under the Egyptians. It was the best news they could possibly have received. And the promise that God would rescue them was preceded by the affirmation, “I am the Lord”. The burdens of this yoke had been heavy. At times they must have wondered whether this long epoch of their history would ever end. But God can and he does, move history along. 
Centuries later there was to come an Israelite who made a similar promise not to his nation but to all people, “Come to me, all you who are weary and burdened, and I will give you rest. Take my yoke upon you and learn from me, for I am gentle and humble in heart, and you will find rest for your souls. For my yoke is easy and my burden is light” (Mt 11:28, 29, 30). 
Christian believers are not excused the burden of sometimes back-breaking workloads or deep heaviness of heart from sorrow and grief. But they have one who welcomes them and shares their load. 

I am coming Lord, coming now to thee.