Cursed be Canaan; a servant of servants shall he be unto his brethren.
A blessing is the bestowment of divine favour and protection. It is a great privilege and an honour. It does, however, come with great responsibility. In that sense, it is a double-edged sword: it cuts both ways. For every blessing that you receive, G-d expects you to do something with it, make something of it, disseminate the fruits of it.