All of life is a response to God. We breathe because God gave us the breath of life. We inhabit the place where we live because God made us to live there. "We love because He first loved us." - 1 John 4:19 Life is, in essence, a response to God Himself who made us and loved us. Yet how often we live out of our own energy and strength and virtue. When we realize the sad reality that our energy is not enough and our strength often fails us and our virtue is tainted by our fallenness we lose hope in our ability to "pull life off."
God never designed us to "rely" on our virtue, He designed us to live out of His. That's why 1 John 4:16 says, "And so we know and rely on the love God has for us." That's how we "pull life off." Because as 1 Corinthians 13 says, "Love never fails."