Charles H. Spurgeon on Psalms 84:5

Blessed is the man whose strength is in thee. Having spoken of the blessedness of those who reside in the house of God, he now speaks of those who are favoured to visit it at appointed seasons, going upon pilgrimage with their devout brethren: he is not, however, indiscriminate in his eulogy, but speaks only of those who heartily attend to the sacred festivals. The blessedness of sacred worship belongs not to half hearted, listless worshippers, but to those who throw all their energies into it. Neither prayer, nor praise, nor the hearing of the word will be pleasant or profitable to persons who have left their hearts behind them. A company of pilgrims who had left their hearts at home would be no better than a caravan of carcasses, quite unfit to blend with living saints in adoring the living God. In whose heart are the ways of them, or far better, in whose heart are thy ways. Those who love the ways of God are blessed. When we have God's ways in our hearts, and our heart in his ways, we are what and where we should be, and hence we shall enjoy the divine approval.