One form of gentleness that we should all practice is towards ourselves. We should never get irritable with ourselves, fretting at our imperfections. It is entirely reasonable to be displeased and feel sorry when we have done something wrong, but we should refrain from being full of self-recrimination, fretful or spiteful to ourselves.
... We should regard our faults with calm, collected and firm displeasure. Just as a judge, when sentencing a criminal, functions much better when guided by reason, conducting the proceedings with tranquility, rather than allowing himself to have an emotional or violent response to the case; so too we will correct ourselves better by a quiet persevering repentance than by an irritated, hasty and passionate one.
... When your heart has fallen, raise it up softly, gently, humbling yourself before God, acknowledging your fault, but without being surprised at your fall. Human infirmity is infirmity; human weakness is weak; and human frailty is frail. Own your fault before God, and return to the way of virtue which you had forsaken, with great courage and confidence in the mercy of God.
Frances De Sales (1567-1622)