I can say is that synthesis is, whilst unity is achieved and is the reward of action and effort. As you progress upon the Path of Initiation the meaning of unity clarifies. As you direct yourself towards the Way of the Higher Evolution synthesis emerges. U nity is the foundation of togetherness, of harmony, cooperation and right human relations.
Unity is the passage of integration and initiation.
Unity is built through the renunciation and sacrifice of all those elements that are not in harmony with the prototype of the soul. Initiation is the stage by stage expansion and fusion of ones consciousness with the greater whole. Initiation charges one with higher energy - higher levels of synthesis. The first labor of the human soul is to synthesize the heart, mind and solar plexus into a unified whole. It is through a deep sense of unity we receive the inspiration to renounce and transform all hindrances that prevent us from serving the synthesis of Life.