One of the memorable dialogues that the Tom Hanks movie Forrest Gump had was "Life was like a box of chocolates. You never know what you're gonna get."
But my take is slightly different.
Life is like a game of Sudoku.
The game is slow, consumes a lot of patience and gets frustrating at times.
But winning the game requires the energy to go on.
At times, one finds stuck - not being able to figure which digit is to be placed in a box, stalling all progress on the game.
And then the breakthrough come out of nowhere..... that comes alongwith a rush of adrenalin. And you are set to complete the game.
That's precisely what life is, we've got to go on.... unless we go on, we will not get anything out of life....