Let us not become weary in doing good, for at the proper time we will reap a harvest if we do not give up. Galatians 6:9
Tiredness is an emotional state that many times takes place when we are not rewarded for the works we have done. Man seeks to be seen, applauded, recognized and admired for what he does. When this does not happen, disappointment comes; he becomes demotivated and away it goes the desire he had at the beginning.
Everything we do must be pleasing to God, not men. It is necessary for us to acknowledge our intentions and, if not the right ones, we must change. For he who sows to please the flesh, for the flesh will reap; but he who sows to please the Spirit, for the Spirit will reap.
As children of God, we must never become weary in doing good, not looking at the outside but at the inside, because in due time we will reap abundantly all the good we sowed.