3 If he is drawn, says some one, he comes unwillingly. If he comes unwillingly, then he believes not; but if he believes not, neither does he come. For we do not run to Christ on foot, but by believing; nor is it by a motion of the body, but by the inclination of the heart that we draw near to Him. This is why that woman who touched the hem of His garment touched Him more than did the crowd that pressed Him. Therefore the Lord said, “Who touched me?” And the disciples wondering said, “The multitude throng You, and press You, and sayest Thou, Who touched me?” And He repeated it, “Somebody has touched me.”
That woman touched, the multitude pressed. What is “touched,” except “believed”? Whence also He said to that woman that wished to throw herself at His feet after His resurrection: “'Touch me not; for I am not yet ascended to the Father.” You think me to be that alone which you see, “touch me not.” What is this? Thou supposest that I am that alone which I appear to you: do not thus believe; that is, “touch me not for I am not yet ascended to the Father.” To you I am not ascended, for thence I never departed.
She touched Him not while He stood on the earth; how then could she touch Him while ascending to the Father? Thus, however, thus He willed Himself to be touched; thus He is touched by those by whom He is profitably touched, ascending to the Father, abiding with the Father, equal to the Father.
Source: Tractates on the Gospel of John (New Advent)