I have wrapped my dreams in a silken cloth,
And laid them away in a box of gold;
Where long will cling the lips of the moth,
I have wrapped my dreams in a silken cloth;
I hide no hate; I am not even wroth
Cullen is referring to his dreams of racial equality and freedom for his people which he knows he will not see any time soon. These dreams are very valuable/rich which is why he mentions wrapping them in lavish materials such as silk and gold.