But it is clear we must embrace struggle. Every thing conforms to it. Everything in nature grows and struggles in its own way, establishing it own identity, insisting on it at all cost, against all resistance. We can be sure of very little, but the need to court struggle is a surety that will not leave us. It is good to be lonely, for being alone is not easy. The fact that something is difficult must be one more reason to do it.
To love is also good, for love is difficult. For one human being to love another is perhaps the most difficult task of all, the epitome, the ultimate test. It is that striving for which all other striving is merely preparation.
– Rainer Maria Rilke 

From Letters To A Young Poet