If I need you to me your everything
If I have you if I love you just the same
If you're here the night is likely going to fall
If you're gone I'll see the daylight in that song

If I stand alone understanding what is now
If I ever need someone to show me how
If the daylight can be hidden by the sun
If you're gone then I'll know why I miss someone

If I love you if I know how much I care
If I find the things you want aren't anywhere
If I know you I may never know your name
If you're gone then there is nothing that remains

The Byrds cover, from their 1965 2nd album "Turn! Turn! Turn!" Written by member/songwriter Gene Clark. The song also appeared on Clark's debut solo album "Echoes" in 1967.