For what we are repent to allah earliar,we can repent when death approaches ?

(4:17)
'But of no avail is repentance of those who do evil until death approaches
any one of them and then he says: 'Now I repent.' Nor is the repentance 
of those who die in the state of unbelief of any avail to them. For them 
We have kept in readiness a painful chastisement.'