Love is a feeling Examples  Joy
Hate
Love
Trust
Fear
Surprise
Sadness
Disgust
Hate
Anger
Anticipation
Guilt Is love a mental state?
Yes, love is a feeling of caring for, a strong preference for, a reverence for, a good will acceptance of And these things can apply to love of things, experiences, people, gods,  

Feelings are mental experiences, which arise as the brain interprets emotions,
and emotions themselves physical states arising from the body’s responses to external stimuli.
Feelings are sparked by emotions and colored by thoughts, memories,
and images that have become subconsciously linked with that particular emotion.

Someone could love ice cream,  another person romantically, animals, their child, a god, an experience, people, themselves Love does not describe a constant state.   Feelings come and go.  It is not an object. 
What about accepting everything?  That is not love that is a philosophical position and hypothetical. 
Acceptance is not always a feeling therefore not always love.  To accept means to agree to receive whether willingly or reluctantly,
to willingly take something that is offered; to say “yes” to an offer, or to not resist a situation.
Suppose someone was hurting your child. If you accepted everything you would do nothing to stop it.
That is not love.   Acceptance can be a form of love but it is only so when it is a feeling of good will. 
Surrendering may be positive or negative.  It could be done to allow love to occur but
it is not love.  Surrendering means giving up control over a situation, accepting a situation. 
 But like love, acceptance and surrendering are temporary things.   
And love is not always good. You might love doing bad things.  All love is not good love. 
Love is a feeling and it is one type of feeling among many. 
And one can give or receive love, one can love, hate or be indifferent towards something. 
These other feelings are part of reality just like love is. If they weren't there would be no word for love. 
Is a god love?  No. That is a different word. A god could love but love is not a god. 
Are there such things as "higher" and "lower" forms of love?   
 Generally people thinking in these hierarchical terms might rank
love of a god or love of one's child to be above romantic love or love for an object or an experience. 
However these are all feelings and love by definition is a feeling. 
Feelings are intrinsic to being human.  They come and they go and are a part of being alive. 
Love can be beneficial. If people love you they often will help you if you need help.
If there is a "higher" form of love that is it, helping one another.