"dark" here infers to the difficulties and the misery a person is facing.
"sky" infers to hope of success.
This sentence means that after overcoming all kinds of difficulties,a man's ability will increase and will become more likely to succeed
"dark" here infers to the difficulties and the misery a person is facing.
"sky" infers to hope of success.
This sentence means that after overcoming all kinds of difficulties,a man's ability will increase and will become more likely to succeed