How did Jesus sum up the higher life?

All that we may know of that higher life is summed up in the teaching of Jesus—probably all that we can understand of it—certainly, all that we need to know. 

First—

Be ye perfect—

Out of that comes the service of the strong to the feeble—

Whosoever will be chief among you, let him be your servant. 

It is more blessed to give than to receive. 

Primarily, it is a life of growth and service.