What does it mean that before every dawn, there must be a long dark night that is about to be suffocated

Before every glimmer of dawn, it must be a long dark night that is about to suffocate; before every glory comes, there must be too many wretched moments, days of being looked down upon; before every burst of applause comes, there are always too many sighs, too many cold stares; on the summit of every mountain, there are always seashells; so, at every moment when you are about to give up, remember to say to yourself: come on, hold on!