Life is possible only through challenges. Life is possible only when you have both good weather and bad weather, when you have both pleasure and pain, when you have both winter and summer, day and night. When you have both sadness and happiness, discomfort and comfort. Life moves between these two polarities. Moving between these two polarities you learn how to balance. Between these two wings you learn how to fly to the farthest star.
Experience life in all possible ways -- good-bad, bitter-sweet, dark-light, summer-winter. Experience all the dualities. Don't be afraid of experience, because the more experience you have, the more mature you become.
Remember: life is a rhythm between day and night, summer and winter. It is a continuous rhythm. Never stop anywhere! Be moving! And the bigger the swing, the deeper your experience will be.