If a man doubts his manliness, he needs only to believe what is already true. God created him to be a man and to live as a man by being strong and keeping His Word. Even a man that the world would consider weak, feeble, and the least 'manly' can be stronger than many in the world if he believes God and keeps His commandments. He does not need to take a trip to the wilderness and wait for a voice from heaven to declare to his soul that he is a man. He does not have to wait for his father or some father figure to somehow bestow 'manness' upon him. He doesn't have to prove to himself or to others that he has what it takes to do whatever the world or he himself deems is important and manly. Masculinity is given by God to men, and men must live it out Biblically rather than perverting it and redefining it in worldly, carnal, and selfish terms.