Whatever it might be, the signs are universal: it's what makes you burn, brings you joy, makes life good, gets you up in the morning (sometimes keeps you awake in the night, too) and -- even with the knowledge that it'll never be fully perfect nor without its sufferings, burdens and trials -- you really can't see yourself doing any other thing with your days and giving it everything you've got.
In a nutshell, your call is that one thing above the rest which makes you happy and gives life to you and others. You'll know it simply by finding it and knowing you can't be anywhere else -- and in some cases, even now, even if you don't think you know or have found it, somewhere down deep inside, it's already there and maybe just needs a little extra figuring out.
mk
