Do not think that because you do not manifest decided hostility to Christ you are doing Him service. We thus deceive our own souls. By withholding that which God has given us to use in His service, be it time or means or any other of His entrusted gifts, we work against Him.
Satan uses the listless, sleepy indolence of professed Christians to strengthen his forces and win souls to his side. Many, who think that though they are doing no actual work for Christ, they are yet on His side, are enabling the enemy to pre-occupy ground and gain advantages. By their failure to be diligent workers for the Master, by leaving duties undone and words unspoken, they have allowed Satan to gain control of souls who might have been won for Christ. — Christ Object Lessons p. 279-280