"Hardship, loss, and humility are extremely difficult waters to navigate," he tweeted on Monday, "but perseverance thru them builds a strength to withstand anything life throws your way."
The WWE star also shared the following quote from Walt Whitman on Sunday: "Keep your face always toward the sunshine—and shadows will fall behind you."
"Anybody feeling down, check out #WaltWhiteman," he tweeted along with the quote, "has always been a helpful voice in times of crisis. Beautifully, wild thinker and was certainly onto something with ideas like these."
John and Nikki announced their split on Sunday.
"While this decision was a difficult one, we continue to have a great deal of love and respect for one another," they said in a statement to E! News. "We ask that you respect our privacy during this time in our lives. "
A rep for the couple also confirmed the news.
"After much contemplation and six years of being together Nikki Bella and John Cena announced today their decision to separate as a couple," the rep stated.