Paradox in "Do Not Go Gentle into That Good Night"

In the first stanza of "Do Not Go Gentle into That Good Night," the speaker commands his father, "Do not go gentle into that good night, Old age should burn and rave at close of day..." The night refers to death throughout this poem. The author uses other images of night to describe death such as in line 4 when the speaker states, "wise men at their end know dark is right..." Death is referred to as a good thing and as the right thing. However, the speaker tells his father to "not go gentle" into death. This is a paradox because usually if something is referred to as a good thing, then it would seem natural to want to have it. But instead the speaker suggests that "wise men...rage against the dying of the light." This paradox is justified through the speaker's feelings for his father. He does not want his dad to die, even if it is the right thing. He cares about his father and does not want to be without him on earth.