Sometimes I feel very sad when I come down from meditation.
The sadness that you feel is quite natural, because you were in a higher world and then you had to come back to the earthly level. At that time, the worries and problems of the world enter into you. But if you meditate sincerely for a few years, these problems will not stand in your way, because when you come down from your meditation, you will have tremendous peace, poise, joy and love for humanity.
Right now you have boundless love for your child. But after you have meditated for a few years, you will have even more love for your child, because you will feel the presence of God inside him. Right now you do not feel the presence of God inside your child all the time. If he is naughty or if he breaks something, then you do not think that God is operating inside him. At that time you are exasperated and you say, "No, no, this is not God; this is the devil incarnate." But there will come a time when you will see God inside your son all the time, no matter what he does or what he says. When you progress to that point, you will not feel drained when you come down from your meditation. On the contrary, even when you enter into the activities of ordinary life you will be able to maintain the same joy, delight, peace and poise.
When you are meditating you have to feel that you are climbing a tree. You are going up high, higher, highest to collect the mangoes and bring them down for distribution. But if you feel sad when you come down, that means you want to eat them all by yourself at the top of the tree. You don't want to bring them down and share them with others. So when you go up, always go up with joy; and when you come down, also come down with joy. When you go up, feel that it is for achievement of the highest; and when you come down from meditation, feel that it is for distribution.