The path is long and narrow alright but never dark or unprofitable.
The promises:
a. I am the light of the world. Whoever follows me will never walk in darkness, but will have the light of life
b. No one who has left home or brothers or sisters or mother or father or children or fields for me and the gospel will fail to receive a hundred times as much in this present age: homes, brothers, sisters, mothers, children and fields—along with persecutions—and in the age to come eternal life.