The grass is always greener on the other side

Humans being humans will never be satisfied with what they have.
At work:
When you just begin, the first few hours/days will be boring and being ignored at times - you wish to begin training so the boredom will cease.
Then it's entering the training stage, you yawn and might even do some 'fishing' - you wish to start working so the yawning stops.
When you finally begin to work... you wish it's your first day so you don't need to work!!