"You cannot safely make this division (between love and a call for love), for you are much too confused, either to recognize love, or to believe that EVERYTHING else is nothing but a NEED for love. You are too bound to form, and NOT to content. What you CONSIDER content, is not content at all. It is merely form, and nothing else. For you do NOT respond to what a brother REALLY offers you, but only to the particular perception o this offering by which your EGO judges it. The ego is incapable of understanding content, and is totally unconcerned with it. To the ego, if the form is acceptable, the content MUST be. Otherwise, it will attack the form."
So here Jesus is saying that Holy Spirit is able to clearly distinguish love from a 'call for love' because He clearly recognizes what love really IS, and therefore can tell when something is a call for love. But we have a lot of ego judgements in us and this prevents us from being able to make this call on our own, at least not until later after there has been a lot of purification. We are here to learn HOW to discern love from a call for love, by getting our own call for love answered BY love, enough to have some discernment. Discernment is a characteristic of the Holy Spirit, not the ego.