The best verse for this is: Whatsoever a man soweth, that shall he also reap. Galatians 6:7 In this verse God sees everything we think, everything we say and everything we do. We may think He does not see but He does and eternal consequences ( and short term ones) are real. In the context it days something about “God is not mocked“, because some think that we can escape the consequences of our actions and sins. So sow good things and positive things and spiritual things so we and others can reap the benefits.