Many great Buddhists believe in Theosophy, and many great Theosophists are Buddhists.
The two belief systems are partners on the way towards consciousness.
Theosophy is the belief in the eternal nature of existence and the immortality of our higher selves, and that everything happens in accordance with the universal laws of our paradigm.
Buddhism and the practice of meditation calms the chatter of our minds, allowing our real emotions to bubble up from within. The pain hurting the core of us can been heard. We listen to these emotions, release them. Realize impermanence.
Our higher self is our guide and consciousness our goal.
Theosophy is an overall picture and Buddhism is an individual way to live.