Matthew 6:1 But take care not to do your righteousness before men in order to be gazed at by them; otherwise, you have no reward with your Father who is in the heavens. Isaiah 45:15 Verily thou [art] a God that hidest thyself, O God of Israel, the Saviour.
The universe indicates that God is hidden, that God is secret. Although He has done a great many things, people are not aware that He has done them. We may have seen the things done by God, but none of us has ever seen Him, for He is always hidden, always secret.
God's life is of such a secret and hidden nature. If we love others by our own life, this life will seek to make a display of itself before men. But if we love others by the love of God, this love will always remain hidden.
Our human life loves to make a display, a public show, but God's life is always hidden. A hypocrite is one who has an outward manifestation without having anything within. Everything he has is merely an outward show; there is no reality inwardly.
This is absolutely contrary to God's nature and to His hidden life. Although God has so much within Him, only a little is manifested. If we live by this divine life, we may pray much, but others will not know how much we have prayed.
We may give a great deal to help others, but no one will know how much we give. We may fast often, but this also will not be known by others. We may have a great deal within us, but very little will be manifested.
This is the nature of the kingdom people in the doing of their righteous deeds.