Many times when things don’t go our way resentment can build up over time. This can cause us to become bitter over certain situations. Bitterness toward others causes us to be harsh, sharp, and resentful. It causes us to speak harshly to others and to be negative. It causes us to have a bad attitude toward others.
Having a good attitude toward other means speaking to them in a positive, motivating way at all times, even during bad situations. Even rebuking should not be done with bitterness. The Scriptures tell us to rebuke and exhort, but even this should not be done with harshness and sharpness.
2 Timothy 4:2 Preach the word; be instant in season, out of season; reprove, rebuke, exhort with all longsuffering and doctrine. (2Ti 4:2 KJV)
There is a time to rebuke, but we should not do it with bitterness. The key here is longsuffering. Longsuffering can wear us down over time, but we should never allow it to make us bitter.