Emotions are strong, powerful beings; they are bigger than us; they extend out beyond us and fold us into the world; they are the ropes that hold us in place, the glues that bond us together, the thermostats and gauges by which we experience our well-being, or lack of it. Without them we would only be half alive soliptical zombies, or even automatons. What point would there be in life if you never wished to dance with joy? Never knew excitement, anticipation, longing, love, grief, loss or any and all of the other pantheon of emotions? They very much are just such a stuff as life is made out of.
The point is to know them for what they are. To let them be an honest part of your life. To let them flow through you like the natural streams that they are, not to dam them up, divert them, trap them or let them become foetid and stagnant. It is the psycho-dramas that we play that diverts them and which can make them so destructive. (At this point think of R D Lang or of CBT, and such like.)
Imagine your emotions as a wild horse upon which you must ride. You can just cling on, suffer and be carried where they will take you, or master the horse, tame it, make a friend of it, harness its energies and develop a harmonious relationship with it. You care for and nurture your emotions much as you would any other animal which you have. It is a life long companion that will carry you well, even through the heat of battle or on long and perilous journeys. Your emotions are your allies - let them not be your masters.
The point of much meditation is to observe yourself as a rider. This you can only do when you learn to quieten the incessant head chatter, the fleeting psychodramas, the pseudo images of self. Then you can let go of all of that and simply be. Only when you can sit, purposeless and quiet, that can you begin to learn. It is like developing a good seat in ridding so that you sit naturally and balanced and in a harmonious way with your horse. In this case the horse happens to be yourself.
A good rider is a good companion to ride with. A poor rider is a liability, or even a danger, to themselves and to others. They are not fun to ride with. They would be disastrous to undertake a journey with.
Zazen, or Zen style meditation, sometime call whole-hearted sitting, is a counterbalance to action. It is where one learns to sit well on one's own being, so that when faced with action you do not become unseated. It is the schooling ring where you master the seat that will enable you to ride through anything.
Traditionally many Samurai warriors would practice Zen because it gave them the supper clear mind with which they could face whatever their bonds of duty demanded of them. Likewise the taiko drummers practice zazen to give them the clarity of mind needed to perform. Good zazen lead to clear minded, and therefore more effective, living. It is no accident that great art, music, drama, sporting achievement or intellectual attainment all require a clear mind.