Yes, according to Ellen G. White's writings, the Holy Spirit was present and active on earth before Christ's ascension to heaven. - The Holy Spirit had been in the world "from the very beginning of the work of redemption," moving upon people's hearts even during the patriarchal age. However, the Spirit was not manifested in its fullness until after Christ's ascension (see DA 669.1; AA 37.3). - Before His ascension, Christ breathed on His disciples and said, "Receive ye the Holy Ghost" (John 20:22), indicating the Spirit was already at work, though not yet given in its fullness (DA 805.2). - The outpouring of the Holy Spirit at Pentecost, after Christ's ascension, was a special, fuller manifestation and empowerment for the disciples' mission (AA 38.3; COL 327.2). - The Spirit's influence was revealed in marked ways throughout history, but the "more abundant impartation" came after Christ was glorified (DA 805.2; AA 37.3). In summary: The Holy Spirit was present and active on earth before Christ's ascension, but the fullness and special outpouring of the Spirit came after Christ was glorified and ascended to heaven. References: - White, E. G. (1898). The Desire of Ages, p. 669.1, 805.2. - White, E. G. (1911). The Acts of the Apostles, p. 37.3, 38.3. - White, E. G. (1900). Christ’s Object Lessons, p. 327.2.